oecumenical |ˌiːkjuːˈmenɪkəl| — concerned with promoting unity among churches or religions

oedema |ɪˈdiːmə| — swelling from excessive accumulation of watery fluid in cells, tissues, or serous cavities

oedemata |iːˈdiːmətə| — plural form of oedema

oedematous  — (British) Alternative form of edematous.

oedipal |ˈiːdɪpl| — Alternative capitalization of Oedipal

Oedipus |ˈiːdɪpəs| — (Greek mythology) a tragic king of Thebes who unknowingly killed his father Laius and married his mother Jocasta; the subject of the drama `Oedipus Rex' by Sophocles

oenologist  — a specialist in wine making

oersted |ˈərsted| — the magnetic field strength 1 cm from a unit magnetic pole

oesophagi |iːˈsɒfəɡaɪ| — plural form of oesophagus

oesophagus |ɪˈsɑːfəɡəs| — the passage between the pharynx and the stomach

oestrogen |ˈestrədʒən| — a general term for female steroid sex hormones that are secreted by the ovary and responsible for typical female sexual characteristics

oestrum |ˈiːstrəm| — Alternative spelling of estrum.

oestrus |ˈestrəs| — applies to nonhuman mammals: a state or period of heightened sexual arousal and activity

oeuvre |ˈɜːvrə| — the total output of a writer or artist (or a substantial part of it)