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 ]