- positron emission
- paternal property
- portcullis
- pleochroism
- parallax
- photographic memory
- positive (as an electric charge etc)
- positioning time
- positive
- positive pole
- positive discrimination
- positive vetting
- possessing good qualities
- picture specification
- plastic iridocyclitis
- purified protein derivative of tuberculin
- pendulous palate
- physical pendulum
- pendulum respiration
- pneumocystis pneumonis
- pneumocytosis
- pneumocystis carinii pneumonia
- pleximetry
- polyphosphate
- propenoate
- potassium chlorate
- potassium dichromate
- perchlorate
- pyrophosphate
- pathologically
- phosphoacetic acid
- propionaldehyde
- propanal
- phosphoenolpyruvic acid
- propylene glycol
- paraldehyde
- petrify
- peptonisation
- proprionamide
- propanamide
- phenothiazine
- pemphigoid
- pemphigus gangrenosus
- pemphigus foliaceous
- pemphigus neonatorum
- pemphigus vulgaris
- pemphigus vegetans
- psoriasiform syphilide
- psoriasis linguae
- psoriasis rupoides