ptarmigan |ˈtɑːrmɪɡən| — large Arctic and subarctic grouse with feathered feet and usually white winter plumage

pterodactyl |ˌterəˈdæktɪl| — extinct flying reptile

pterosaur |ˈterəˌsɔːr| — an extinct reptile of the Jurassic and Cretaceous having a bird-like beak and membranous wings supported by the very long fourth digit of each forelimb

ptisan |təˈzan ˈtɪzən| — Alternative spelling of tisane.

Ptolemaic |ˌtɑːləˈmeɪɪk| — of or relating to the geocentric Ptolemaic system

ptomaine |ˈtəʊmeɪn| — any of various amines (such as putrescine or cadaverine) formed by the action of putrefactive bacteria