- p. r. n
- P.T.R.
- pachyaemia
- pachycephalia, pachycephaly
- pachyemia, pachyaemia
- pachyglossia
- pachygnathous
- pachylosis
- Pachymeningitis
- pachymeningitis interna
- Pachymeter
- pachyntic
- pachyvaginitis
- pachyvaginitis cystica
- Pagenstecher ointment
- palatal triangle
- palatine tonsil
- palatopharyngeal
- paleoencephalon, palaeoencephalon
- palilalia