- program counter
- program documentation
- program decomposition
- program scheduler
- program crash
- program development system
- pamper
- program design language
- program data set
- post_operative room
- post_operative hypocalcaemia
- protective covering
- parmenides
- postero_inferior border
- pseudo_basidium
- pseudo_parenchyma
- post_paid
- post_free
- post_bulbar duodenal ulcer
- pseudomonas
- pom
- pone
- pseudo_aplastic anaemia
- pseudo_meigs syndrome
- pseudo_ulcer syndrome
- pithing
- proto_hittite
- pix
- piroplasm
- Pick somebody's brains
- Pigeon Pea Plant
- Potter's Wheel
- Pilgrim's Journey
- Primary Tooth
- Physiological Reaction
- Plant Product
- Phlegethon
- Patents
- Pen-friend
- Pen-name
- Percuss
- Permitted
- Petted
- Pinfold
- Pin-money
- Plumaged
- Post-free
- Pre-emption
- Present-day
- Presuming