The Collaborative International Dictionary of English v.0.48:

Pilocarpine \Pi`lo*car"pine\, n. [From NL. Pilocarpus
   pennatifolius jaborandi; L. pilus hair + Gr. karpo`s fruit:
   cf. F. pilocarpine.] (Chem.)
   An alkaloid extracted from jaborandi (Pilocarpus
   pennatifolius) as a white amorphous or crystalline substance
   which has a peculiar effect on the vasomotor system.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pilocarpine
    n 1: cholinergic alkaloid used in eyedrops to treat glaucoma