Hypertext Webster Gateway: "trefoil"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Trefoil \Tre"foil\, n. [L. tres three + E. foil leaf; cf. F.
fr[`e]fle, It. trifoglio, L. trifolium. See {Tri-}, {Foil}
leaf, and cf. {Trifoly}.]
1. (Bot.) Any plant of the genus {Trifolium}, which includes
the white clover, red clover, etc.; -- less properly,
applied also to the nonesuch, or black medic. See
{Clover}, and {Medic}.
2. (Arch.) An ornamental foliation consisting of three
divisions, or foils.
3. (Her.) A charge representing the clover leaf.
From WordNet (r) 1.7 (wn)
trefoil
n 1: any of several Old World herbs of the genus Medicago having
small flowers and trifoliate compound leaves [syn: {medic},
{medick}]
2: a plant of the genus Trifolium [syn: {clover}]
3: an architectural ornament in the form of three arcs arranged
in a circle
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