A camphorated tincture of opium, taken internally for the relief of
diarrhea and intestinal pain

Paris green
Poisonous emerald-green powder, C4H6As6Cu4O16, used as a pigment,
insecticide, and wood preservative.

pedicle (pedicel)
Small stalk or stalk-like structure, especially one supporting or
connecting an organ or other body part. Slender foot-like part, as at
the base of a tumor.

pell mell
Jumbled, confused manner; helter-skelter; frantic disorderly haste;
headlong:

pemphigus
Several acute or chronic skin diseases characterized by groups of
itching blisters.

pennyroyal
Eurasian mint (Mentha pulegium) with small lilac-blue flowers that yield
an aromatic oil. Aromatic plant (Hedeoma pulegioides) of eastern North
America, having purple-blue flowers that yields an oil used as an insect
repellent

peptonize
Convert protein into a peptone (water-soluble protein derivative
produced by partial hydrolysis of a protein by an acid or enzyme ).
Dissolve (food) by means of a proteolytic enzyme.