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Definition of Trefoil
1. Noun. Any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves.
Generic synonyms: Herb, Herbaceous Plant
Group relationships: Genus Medicago, Medicago
Specialized synonyms: Medicago Arborea, Moon Trefoil, Medicago Falcata, Sickle Alfalfa, Sickle Lucerne, Sickle Medick, Calvary Clover, Medicago Echinus, Medicago Intertexta, Black Medick, Hop Clover, Medicago Lupulina, Nonesuch Clover, Yellow Trefoil, Alfalfa, Lucerne, Medicago Sativa
2. Noun. A plant of the genus Trifolium.
Group relationships: Genus Trifolium, Trifolium
Specialized synonyms: Alpine Clover, Trifolium Alpinum, Hop Clover, Lesser Yellow Trefoil, Shamrock, Trifolium Dubium, Crimson Clover, Italian Clover, Trifolium Incarnatum, Purple Clover, Red Clover, Trifolium Pratense, Buffalo Clover, Trifolium Reflexum, Trifolium Stoloniferum, Dutch Clover, Shamrock, Trifolium Repens, White Clover
Generic synonyms: Herb, Herbaceous Plant
3. Noun. An architectural ornament in the form of three arcs arranged in a circle.
Definition of Trefoil
1. n. 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.
Definition of Trefoil
1. a plant having ternate leaves [n -S]
Medical Definition of Trefoil
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