tre·foil /ˈtriˌfɔɪl, ˈtrɛ-/
車軸草,三葉形
Tre·foil n.
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.
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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