Dictionary:

colchicum

  (kŏl'chĭ-kəm, kŏl'kĭ-)

1. Any of various bulbous plants of the genus Colchicum, such as the autumn crocus.
2. The dried ripe seeds or corms of the autumn crocus, both of which yield colchicine.

[Latin, a plant with a poisonous root, from Greek kolkhikon, meadow saffron, after Kolkhos, Colchis.]

The noun has one meaning:

Meaning #1: chiefly fall-blooming perennial cormous herbs; sometimes placed in family Colchicaceae
  Synonym: genus Colchicum