From The Collaborative International Dictionary of English v.0.44 [gcide]:
Trefoil \Tre"foil\, noun [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) 2.0 [wn]:
noun
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
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
41 Moby Thesaurus words for "trefoil": clover, deuce-ace, leash, set of three, shamrock, tercet, ternary, ternion, terzetto, three, threesome, tierce, trey, triad, trialogue, triangle, tricorn, trident, triennium, trihedron, trilogy, trimester, trine, trinity, trinomial, trio, triphthong, triple crown, triple threat, triplet, triplopy, tripod, triptych, trireme, triseme, triskelion, trisul, triumvirate, triunity, trivet, troika
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