- perigrination
- phoria
- paracresol
- Pentecostal religion
- polytheist
- planar graph
- piaf
- preventive attack
- preventive strike
- piperine
- protriptyline
- purine metabolism
- pharmaceutical elegance
- proventriculus
- psychotherapeutic drug
- penicilium glaucum
- phenylpyruvie oligophrenia
- pepin
- peruked
- phloroglucin nitric acid
- python sebae
- plumed tussock
- phlegmonous pancreatitis
- pork belly
- phrenum linguae
- platyctenean
- polysynthetic
- protoceratops
- protodiastolic
- pythoness
- phylogenist
- phylogenetic
- pathological personality
- pathological reflex
- protein engineering
- plasmapheresis
- plateletpheresis
- polycystic ovary syndrome
- polydactyl
- pernicious anemia
- polyconic projection
- periductal
- primordial stage
- pepin the short
- pk value
- programmed computer
- pitt
- passive air defense
- pseudobulbar paralysis
- pulmonary coccidioidosis