proteid (obsolete term)
Protein.

proud flesh
Swollen flesh that surrounds a healing wound, caused by excessive
granulation (Small, fleshy, bead-like protuberances--new capillaries--on
the surface of a wound that is healing).

pruritus
Severe itching, often of undamaged skin.

Prunus Virginiana (Chokecherry)
Astringent fruit of a species of wild cherry; the bush or tree which
bears such fruit.

pterygium
Abnormal mass of tissue on the conjunctiva of the inner corner of the
eye that obstructs vision by covering the cornea.

pulsatilla
Dried medicinal herb from a pasqueflower (especially Anemone pulsatilla)
formerly used to treat amenorrhea and dysmenorrhea.

punctilio
Fine point of etiquette. Precise observance of formalities.

purpura
Hemorrhages in the skin and mucous membranes having the appearance of
purplish spots or patches.