English dictionary


phaeton |ˈfeɪtən| — large open car seating four with folding top

phage |feɪdʒ| — a virus that is parasitic (reproduces itself) in bacteria

phagocyte |ˈfæɡəsaɪt| — a cell that engulfs and digests debris and invading microorganisms

phalange |fəˈlændʒ| — A right-wing Lebanese paramilitary movement based somewhat on the Spanish Falange

phalanges |fəˈlændʒɪz| — plural form of phalange

phalanstery |ˈfælʌnˌsteriː| — An association or community organized on the plan of Charles Fourier, with living space divided hierarchically and higher pay for those carrying out unpopular tasks.

phalanx |ˈfælæŋks| — any of the bones of the fingers or toes

phalli |ˈfælaɪ| — plural form of phallus

phallic |ˈfælɪk| — resembling or being a phallus

phallus |ˈfæləs| — genus of fungi having the cap or pileus hanging free around the stem

phanerogam |ˈfanərəˌɡam| — plant that reproduces by means of seeds not spores

phanerogamic |ˌfænərəʊˈɡæmɪk| — (botany) That reproduces via seeds (rather than spores)

phanerogamous  — phanerogamic

phantasm |ˈfæntæzəm| — a ghostly appearing figure

phantasmagoria |ˌfæntæzməˈɡɔːrɪə| — a constantly changing medley of real or imagined images (as in a dream)

phantasmagoric |fænˌtæzmʌˈɡɔːrɪk| — characterized by fantastic imagery and incongruous juxtapositions

phantasmal |fænˈtæzməl| — resembling or characteristic of a phantom

phantasy |ˈfæntəsɪ| — something many people believe that is false

phantom |ˈfæntəm| — a ghostly appearing figure

Pharaoh |ˈferəʊ| — the title of the ancient Egyptian kings

Pharisaic |ˌfærɪˈseɪɪk| — excessively or hypocritically pious

Pharisaical |ˌfærɪˈseɪɪkəl| — excessively or hypocritically pious

Pharisaism |ˈfærəˌseˌɪzəm| — The doctrines and practices, or the character and spirit, of the Pharisees

Pharisee |ˈfærɪsiː| — a self-righteous or sanctimonious person

pharmaceutic  — drug or medicine that is prepared or dispensed in pharmacies and used in medical treatment

pharmaceutical |ˌfɑːrməˈsuːtɪkl| — drug or medicine that is prepared or dispensed in pharmacies and used in medical treatment

pharmaceutics |fɑːrməˈsuːtɪks| — the art and science of preparing and dispensing drugs and medicines,

pharmaceutist |ˌfɑːməˈsjuːtɪst| — (dated) One skilled in pharmacy; a druggist.

pharmacist |ˈfɑːrməsɪst| — a health professional trained in the art of preparing and dispensing drugs

pharmacological |ˌfɑːrməkəˈlɑːdʒɪkəl| — of or relating to pharmacology

pharmacologist |ˌfɑːrməˈkɑːləˌdʒɪst| — someone trained in the science of drugs (their composition and uses and effects)

pharmacology |ˌfɑːrməˈkɑːlədʒɪ| — the science or study of drugs: their preparation and properties and uses and effects

pharmacopoeia |ˌfɑːrməkəˈpiːə| — a collection or stock of drugs

pharmacy |ˈfɑːrməsɪ| — the art and science of preparing and dispensing drugs and medicines,

pharos |ˈfe(ə)rɒs| — a tower with a light that gives warning of shoals to passing ships

pharyngeal |fəˈrɪndʒɪəl| — a consonant articulated in the back of the mouth or throat

pharyngitis |ˌfærɪnˈdʒaɪtɪs| — inflammation of the fauces and pharynx

pharynx |ˈfærɪŋks| — the passage to the stomach and lungs; in the front part of the neck below the chin and above the collarbone

phase |feɪz| — any distinct time period in a sequence of events

phase-out |ˈfeɪˌzɑːwt| — the act or instance of a planned discontinuation

phased |ˈfeɪzd| — simple past tense and past participle of phase

phasic |ˈfeɪzɪk| — Of or relating to phase

pheasant |ˈfeznt| — large long-tailed gallinaceous bird native to the Old World but introduced elsewhere

phenix |ˈfenɪks| — Archaic spelling of phoenix.

phenol |ˈfiːnɔːl| — any of a class of weakly acidic organic compounds; molecule contains one or more hydroxyl groups

phenology |fəˈnɑːlədʒɪ| — (biology) The study of the effect of climate on periodic biological phenomena.

phenomena |fəˈnɑːmənə| — Plural form of phenomenon.

phenomenal |fəˈnɑːmɪnl| — exceedingly or unbelievably great

phenomenalism |fɪˈnɒmɪn(ə)lɪz(ə)m| — (philosophy) The doctrine that physical objects exist only as perceptual phenomena or sensory stimuli

phenomenological |fɪˌnɒmɪˈnɒlədʒɪ| — (philosophy) Of or relating to phenomenology, or consistent with the principles of phenomenology.

phenomenology |fɪˌnɑːməˈnɑːlədʒɪ| — a philosophical doctrine proposed by Edmund Husserl based on the study of human experience in which considerations of objective reality are not taken into account

phenomenon |fəˈnɑːmɪnən| — any state or process known through the senses rather than by intuition or reasoning

phenotype |ˈfiːnətaɪp| — what an organism looks like as a consequence of the interaction of its genotype and the environment

phenotypic |ˌfɪnəˈtɪpɪk| — of or relating to or constituting a phenotype

pheromone |ˈferəməʊn| — a chemical substance secreted externally by some animals (especially insects) that influences the physiology or behavior of other animals of the same species

phew |fjuː| — Used to show relief, fatigue, surprise, or disgust.

phi |faɪ| — the 21st letter of the Greek alphabet

phial |ˈfaɪəl| — a small bottle that contains a drug (especially a sealed sterile container for injection by needle)

philander |fəˈlandər| — have amorous affairs; of men

philanderer |fɪˈlændərər| — a man who likes many women and has short sexual relationships with them

philandering |ˌfaɪˈlændərɪŋ| — Present participle of philander.

philanthrope |ˈfɪlənˌθrəʊp| — (archaic) A philanthropist.

philanthropic |ˌfɪlənˈθrɑːpɪk| — generous in assistance to the poor

philanthropical  — Of or pertaining to philanthropy; characterized by philanthropy; loving or helping mankind; as, a philanthropic enterprise.

philanthropist |fɪˈlænθrəpɪst| — someone who makes charitable donations intended to increase human well-being

philanthropy |fɪˈlænθrəpɪ| — voluntary promotion of human welfare

philatelic |ˌfɪləˈtelɪk| — of or relating to philately or of interest to philatelists

philatelist |fiːˈlætəlɪst| — a collector and student of postage stamps

philately |fɪˈlætəlɪ| — the collection and study of postage stamps

philharmonic |ˌfɪlərˈmɑːnɪk| — a large orchestra; can perform symphonies

philhellenic |ˌfɪlheˈliːnɪk| — characterized by a love of Greece and Grecian things

philippic |fəˈlɪpɪk| — a speech of violent denunciation

Philippine |ˈfɪlɪpiːn| — official language of the Philippines; based on Tagalog; draws its lexicon from other Philippine languages

Philistine |ˈfɪlɪstiːn| — a person who is uninterested in intellectual pursuits

Philistinism |ˈfɪlɪstɪnɪzm| — a desire for wealth and material possessions with little interest in ethical or spiritual matters

philogynist |fɪˈlɑːdʒənɪst| — someone who is fond of women as a group

philologic  — philological

philological |ˌfɪləˈlɒdʒɪkəl| — of or relating to or dealing with philology

philologist |fɪˈlɒlədʒɪst| — a humanist specializing in classical scholarship

philology |fɪˈlɑːlədʒɪ| — the humanistic study of language and literature

Philomel |ˈfɪləmel| — (poetic) The nightingale.

philoprogenitive |fɪləʊprəʊˈdʒenɪtɪv| — Prolific, or producing many offspring.

philosopher |fəˈlɑːsəfər| — a specialist in philosophy

philosophic |ˌfɪləˈsɑːfɪk| — characterized by the attitude of a philosopher; meeting trouble with level-headed detachment

philosophical |ˌfɪləˈsɑːfɪkl| — characterized by the attitude of a philosopher; meeting trouble with level-headed detachment

philosophically |ˌfɪləˈsɑːfɪkəlɪ| — in a philosophic manner

philosophize |fəˈlɑːsəfaɪz| — reason philosophically

philosophy |fəˈlɑːsəfɪ| — a belief (or system of beliefs) accepted as authoritative by some group or school

philter  — a drink credited with magical power; can make the one who takes it love the one who gave it

philtre |ˈfɪltər| — a drink credited with magical power; can make the one who takes it love the one who gave it

phiz |fɪz| — English illustrator of several of Dickens' novels (1815-1882)

phlebitis |fləˈbaɪtɪs| — inflammation of a vein (usually in the legs)

phlebotomize |flɪˈbɑːtəˌmaɪz| — draw blood

phlebotomy |fləˈbɑːtəmɪ| — surgical incision into a vein; used to treat hemochromatosis

phlegm |flem| — apathy demonstrated by an absence of emotional reactions

phlegmatic |fleɡˈmætɪk| — showing little emotion

phlegmatical  — showing little emotion

phlegmon |ˈfleɡmɒn| — A solid mass formed by inflamed connective tissue, such as forms around an appendix in appendicitis.

phloem |ˈfləʊem| — (botany) tissue that conducts synthesized food substances (e.g., from leaves) to parts where needed; consists primarily of sieve tubes

phlogistic |fləˈdʒɪstɪk| — Pertaining to phlogiston.

phlogiston |fləˈdʒɪstən| — a hypothetical substance once believed to be present in all combustible materials and to be released during burning

phlox |flɑːks| — any polemoniaceous plant of the genus Phlox; chiefly North American; cultivated for their clusters of flowers

phobia |ˈfəʊbɪə| — an anxiety disorder characterized by extreme and irrational fear of simple things or social situations

Phoebe |ˈfiːbɪ| — the cardinal number that is the sum of four and one

Phoebus |ˈfiːbəs| — (Greek mythology) Greek god of light; god of prophecy and poetry and music and healing; son of Zeus and Leto; twin brother of Artemis

Phoenician |fəˈniːʃn| — a member of an ancient Semitic people who dominated trade in the first millennium B.C.

phoenix |ˈfiːnɪks| — the state capital and largest city located in south central Arizona; situated in a former desert that has become a prosperous agricultural area thanks to irrigation

phonal |ˈfəʊnəl| — Of or relating to the voice.

phone |fəʊn| — electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds

phoneme |ˈfəʊniːm| — (linguistics) one of a small set of speech sounds that are distinguished by the speakers of a particular language

phonemic |fəˈniːmɪk| — of or relating to phonemes of a particular language

phonetic |fəˈnetɪk| — of or relating to speech sounds

phonetically |fəˈnetɪkəlɪ| — by phonetics

phonetician |ˌfəʊnəˈtɪʃən| — a specialist in phonetics

phoneticize |fəʊˈnetɪsaɪz| — to spell by phonetic script

phonetics |fəˈnetɪks| — the branch of acoustics concerned with speech processes including its production and perception and acoustic analysis

phonetist |ˈfəʊnɪtɪst| — One versed in phonetics; a phonologist.

phoney |ˈfəʊnɪ| — a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives

phonic |ˈfɑːnɪk| — pertaining to the phonic method of teaching reading

phonics |ˈfɑːnɪks| — teaching reading by training beginners to associate letters with their sound values

phonogram |ˈfəʊnəɡræm| — any written symbol standing for a sound or syllable or morpheme or word

phonograph |ˈfəʊnəɡræf| — machine in which rotating records cause a stylus to vibrate and the vibrations are amplified acoustically or electronically

phonographic |ˌfəʊnəˈɡræfɪk| — of or relating to phonography or to a phonograph

phonography |fəʊˈnɑːɡrəfiː| — the transcription of speech using symbols

phonologic |ˌfəʊnəˈlɒdʒɪk| — of or relating to phonology

phonological |ˌfəʊnəˈlɑːdʒɪkəl| — of or relating to phonology

phonology |fəˈnɑːlədʒɪ| — the study of the sound system of a given language and the analysis and classification of its phonemes

phonometer |fəˈnɑːmɪtər| — An instrument for measuring sounds.

phonoscope |ˈfəʊnəskəʊp| — a device that shows an image representing the acoustical properties of a musical instrument etc.

phony |ˈfəʊnɪ| — a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives

phosgene |ˈfɑːzdʒiːn| — a colorless poisonous gas that smells like new-mown hay; used in chemical warfare

phosphate |ˈfɑːsfeɪt| — a salt of phosphoric acid

phosphide |ˈfɑːsfaɪd| — (chemistry) Any binary compound of phosphorus, especially one in oxidation state −3.

phosphite |ˈfɑːsfaɪt| — (chemistry) any salt or ester of phosphorous acid

Phosphor |ˈfɑːsˌfɔːr| — a synthetic substance that is fluorescent or phosphorescent; used to coat the screens of cathode ray tubes

phosphor-bronze |ˈfɒsfəbrɒnz| — Any alloy of copper with 3.5 to 10% tin and up to 1% phosphorus, notable for toughness, strength, low coefficient of friction, and fine grain.

phosphorate |ˈfɑːsfəˌreɪt| — to combine or treat with phosphorus; to phosphorize

phosphoresce |ˌfɑːsfəˈres| — to exhibit phosphorescence

phosphorescence |ˌfɑːsfəˈresns| — a fluorescence that persists after the bombarding radiation has ceased

phosphorescent |ˌfɑsfəˈresənt| — emitting light without appreciable heat as by slow oxidation of phosphorous

phosphoric |ˈfɑːsfərɪk| — containing or characteristic of phosphorus

phosphorite |ˈfɑːsfəˌraɪt| — (mineralogy) a sedimentary rock rich in phosphate minerals such as apatite

phosphorous |ˈfɑːsfərəs| — containing or characteristic of phosphorus

phosphorus |ˈfɑːsfərəs| — a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms

phot |fɑːt| — a unit of illumination equal to 1 lumen per square centimeter; 10,000 phots equal 1 lux

photic |ˈfəʊtɪk| — of or relating to or caused by light

photo |ˈfəʊtəʊ| — a representation of a person or scene in the form of a print or transparent slide or in digital format

photoactive |ˌfəʊtəʊˈæktɪv| — Able to convert the energy of light into electricity via photoelectricity

photobiotic |ˌfəʊtəʊbaɪˈɑːtɪk| — (biology) that depends on light for life and growth

photocell |ˈfəʊtəʊsel| — a transducer used to detect and measure light and other radiations

photochemical |ˌfəʊtəʊˈkemɪkl| — of or relating to or produced by the effects of light on chemical systems

photochemistry |ˌfəʊtəʊˈkemɪstriː| — branch of chemistry that deals with the chemical action of light

photochromic |ˌfəʊtə(ʊ)ˈkrəʊmɪk| — of, related to, or produced by photochromism

photochromy |ˈfəʊtəkrəʊmɪ| — The art or process of reproducing colours by photography.

photoconductivity |fəʊtəʊˌˌkɑːndəkˈtɪvɪtiː| — change in the electrical conductivity of a substance as a result of absorbing electromagnetic radiation

photocopy |ˈfəʊtəʊkɑːpɪ| — a photographic copy of written or printed or graphic work

photoelectric |ˌfəʊtəʊɪˈlektrɪk| — of or pertaining to photoelectricity

photoelectrical  — of or pertaining to photoelectricity

photoelectricity |ˈfəʊtəʊˌɪlekˈtrɪsɪtɪ| — electricity generated by light or affected by light

photoengrave  — To make a photoengraving of an image

photoengraving  — an engraving used to reproduce an illustration

photogenic |ˌfəʊtəʊˈdʒenɪk| — looking attractive in photographs

photograph |ˈfəʊtəɡræf| — a representation of a person or scene in the form of a print or transparent slide or in digital format

photographer |fəˈtɑːɡrəfər| — someone who takes photographs professionally

photographic |ˌfəʊtəˈɡræfɪk| — representing people or nature with the exactness and fidelity of a photograph

photography |fəˈtɑːɡrəfɪ| — the act of taking and printing photographs

photogravure |ˌfəʊtəɡrəˈvjʊər| — printing from an intaglio plate prepared by photographic methods

photojournalism |ˌfəʊtəʊˈdʒɜːrnəlɪzəm| — journalism that presents a story primarily through the use of pictures

photolithography |ˌfəʊtəʊlɪˈθɒɡrəfɪ| — a planographic printing process using plates made from a photographic image

photolysis |fəʊˈtɑːlɪsɪs| — (chemistry) Any chemical reaction in which a compound is decomposed after absorbing a photon

photomechanical |fəʊtəʊməˈkænɪkəl| — of or relating to or involving various methods of using photography to make plates for printing

photomechanics |ˌfəʊtəʊmɪˈkænɪks| — the process whereby printing surfaces (plates or cylinders) are produced by photographic methods

photometer |fəʊˈtɒmɪtə| — measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source

photometric |ˌfəʊtəʊˈmetriːk| — of or relating to photometry

photometrical  — of or relating to photometry

photometry |fəʊˈtɑːmɪtriː| — measurement of the properties of light (especially luminous intensity)

photomicrograph |fəʊtəʊˈmaɪkrəˌˌɡræf| — a photograph taken with the help of a microscope

photomicrography |ˌfəʊtəʊmaɪˈkrɒɡrəfɪ| — (photography) photography using a microscope

photomontage |ˌfəʊtəʊmɑːnˈtɑːʒ| — a montage that uses photographic images

photon |ˈfəʊtɑːn| — a quantum of electromagnetic radiation; an elementary particle that is its own antiparticle

photonic  — of, or relating to photons or to photonics

photophilous  — Thriving in the presence of light.

photophobia |fəʊtəˈfəʊbiːə| — a morbid fear of light

photoplay |ˈfəʊtəˌpleɪ| — a theatrical play that has been filmed for showing as a movie.

photosensitive |ˌfəʊtəʊˈsensətɪv| — sensitive to visible light

photosensitivity  — sensitivity to the action of radiant energy

photosphere |ˈfəʊtəsfiːr| — the intensely luminous surface of a star (especially the sun)

photostat |ˈfəʊtəstæt| — a photocopy made on a Photostat machine

photosynthesis |ˌfəʊtəʊˈsɪnθəsɪs| — synthesis of compounds with the aid of radiant energy (especially in plants)

photosynthetic  — relating to or using or formed by photosynthesis

phototelegraphy |fəʊtəʊtəˈleɡrəfiː| — The fax system

phototherapy |ˈfəʊtəʊˈθerəpɪ| — the use of strong light to treat acne or hyperbilirubinemia of the newborn

phototube |ˈfəʊtəʊˈtjuːb| — A gas-filled electron tube that has a photosensitive cathode

phototype |ˈfəʊtəˌtaɪp| — A metal printing block, used in the photogravure process

photovoltaic |ˌfəʊtəʊvɒlˈteɪɪk| — producing a voltage when exposed to radiant energy (especially light)

photozincography |ˌfəʊtəʊzɪŋˈkɡrəfɪ| — A form of photolithography using a zinc plate

phrase |freɪz| — an expression consisting of one or more words forming a grammatical constituent of a sentence

phrase-book |ˈfreɪz bʊk| — A (usually pocket-sized) book consisting of everyday expressions and vocabulary in two languages and intended for travellers who wish to communicate with locals while in other countries (regions in which a different language is spoken).

phrasemonger  — (derogatory) One who uses overelaborate or wordy phrases.

phraseological |ˌfreɪziːəˈlɑːdʒɪkəl| — Of or pertaining to phraseology.

phraseology |ˌfreɪzɪˈɑːlədʒɪ| — the manner in which something is expressed in words

phrasing |ˈfreɪzɪŋ| — the grouping of musical phrases in a melodic line

phratry |ˈfreɪtrɪ| — people descended from a common ancestor

phrenetic |frəˈnetɪk| — excessively agitated; distraught with fear or other violent emotion

phrenic |ˈfrenɪk| — of or relating to the diaphragm

phrenological |ˌfrenəˈlɒdʒɪkəl| — of or relating to phrenology

phrenologist |frɪˈnɒlədʒɪst| — someone who claims to be able to read your character from the shape of your skull

phrenology |frəˈnɑːlədʒɪ| — a now abandoned study of the shape of skull as indicative of the strengths of different faculties

Phrygian |ˈfrɪdʒɪən| — a native or inhabitant of Phrygia

phthisic |ˈθaɪsɪk| — (pathology) A wasting illness of the lungs, such as asthma or tuberculosis; phthisis.

phthisical |ˈtɪzɪkəl| — phthisic

phthisis |ˈθaɪsɪs| — involving the lungs with progressive wasting of the body

phut |ˈfət| — A sound resembling the release of a blast of steam or exhaust.

phyla |ˈfaɪlə| — plural form of phylum

phylactery |fəˈlæktʌriː| — (Judaism) either of two small leather cases containing texts from the Hebrew Scriptures (known collectively as tefillin); traditionally worn (on the forehead and the left arm) by Jewish men during morning prayer

phyllophagous |fɪˈlɑːfəɡəs| — (zoology) Subsisting on leaves; leaf-eating.

phylloxera |ˌfɪləkˈsiːrə| — type genus of the Phylloxeridae: plant lice

phylogenesis |faɪləʊˈdʒenəsɪs| — (biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms

phylogenetic  — of or relating to the evolutionary development of organisms

phylogeny |faɪˈlɑːdʒənɪ| — (biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms

phylum |ˈfaɪləm| — (linguistics) a large group of languages that are historically related

physic |ˈfɪzɪk| — a purging medicine; stimulates evacuation of the bowels

physical |ˈfɪzɪkl| — having substance or material existence; perceptible to the senses

physicality |ˌfɪzɪˈkælətɪ| — preoccupation with satisfaction of physical drives and appetites

physically |ˈfɪzɪklɪ| — in accord with physical laws

physician |fɪˈzɪʃn| — a licensed medical practitioner

physicist |ˈfɪzɪsɪst| — a scientist trained in physics

physics |ˈfɪzɪks| — the science of matter and energy and their interactions

physiocrat |ˈfɪzɪəkræt| — (economics, historical) Any of a group of economists in 18th century France who believed that the government should not seek to influence the operation of natural economic laws.

physiognomic |ˌfɪzɪəˈnɒmɪk| — Of or pertaining to physiognomy

physiognomical  — Of or pertaining to physiognomy.

physiognomist |ˌfɪzɪˈɒnəmɪst| — One who studies, or is an expert in, physiognomy; one who studies the outer appearance of the person (primarily the face) to acquire knowledge of the inner personality.

physiognomy |ˌfɪzɪˈɑːnəmɪ| — the human face (`kisser' and `smiler' and `mug' are informal terms for `face' and `phiz' is British)

physiographer |ˌfɪzɪˈɒɡrəfə| — A specialist in physiography.

physiographic |ˌfɪzɪəˈɡræfɪk| — Of or pertaining to physiography

physiography |fɪziːˈɑːɡrəfiː| — the study of physical features of the earth's surface

physiologic |ˌfɪzɪəˈlɒdʒɪk| — of or consistent with an organism's normal functioning

physiological |ˌfɪzɪəˈlɑːdʒɪkəl| — of or consistent with an organism's normal functioning

physiologically |ˌfɪzɪəˈlɑːdʒɪklɪ| — of or relating to physiological processes; with respect to physiology

physiologist |ˌfɪzɪˈɑːlədʒəst| — a biologist specializing in physiology

physiology |ˌfɪzɪˈɑːlədʒɪ| — the branch of the biological sciences dealing with the functioning of organisms

physiotherapy |ˌfɪzɪəʊˈθerəpɪ| — therapy that uses physical agents: exercise and massage and other modalities

physique |fɪˈziːk| — constitution of the human body

phytogenesis  — (biology) The origin and evolutionary development of plants.

phytogeny |faɪˈtɒdʒɪnɪ| — (biology) phytogenesis

phytology  — the branch of biology that studies plants

phytophagous |faɪˈtɑːfəɡəs| — (of animals) feeding on plants

phytoplankton |ˈfæɪtəʊˌplæŋ(k)t(ə)n| — photosynthetic or plant constituent of plankton; mainly unicellular algae

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