trillium Meaning, Definition & Usage

  1. noun any liliaceous plant of the genus Trillium having a whorl of three leaves at the top of the stem with a single three-petaled flower
    wake-robin; wood lily.

WordNet

Tril"li*um noun
Etymology
NL.; cf. L. trilix triple-woven, triple.
Definitions
  1. (Bot.) A genus of liliaceous plants; the three-leaved nightshade; -- so called because all the parts of the plant are in threes.

Webster 1913