Trillium
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A genus of liliaceous plants; the three-leaved nightshade; --so called because all the parts of the plant are in threes.
Trillium meaning & definition 1 of Trillium.
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A plant with a solitary three-petalled flower above a whorl of three leaves, native to North America and Asia.
Trillium meaning & definition 2 of Trillium.