- polycythemia
 - parasitemia
 - Polycirrus
 - Porphyra
 - Peridinium
 - piaffe
 - peridium
 - polonaise
 - pepino
 - pjs
 - pigtail
 - plainsong
 - panoplied
 - programmed cell death
 - puritanically
 - photocoagulator
 - pulmonary congestion
 - pin cherry
 - prunus pensylvanica
 - prunus nigra
 - pomatomus saltatrix
 - pompeii
 - parasellar tumour
 - paperhanger
 - paperer
 - patentee
 - periwig
 - peruke
 - pearl_fish
 - pollyfish
 - parrotfish
 - polly fish
 - Priacanthus arenatus
 - pubescent
 - port_of_spain
 - photoengraving
 - pudding_wife
 - Pomo
 - pressure aerosol
 - pressure sensation
 - pressure cooker
 - pressure limited respirator
 - pressure in the bowels
 - photometry
 - pelvimetry
 - phencyclidine
 - pseudohallucination
 - phencyclidine hydrochloride
 - psilocin
 - psilocybin