Trillium

[triliәm]

(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.

Typed by Barnaby--From WordNet

(n.) A genus of liliaceous plants; the three-leaved nightshade; -- so called because all the parts of the plant are in threes.

Inputed by Barbara

n. a North American genus of low perennial herbs of the lily family—including wake-robin three-leaved nightshade &c.

Inputed by Eleanor