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1. Any of various plants of the pea family, chiefly of the genera Trifolium and Lotus, having compound trifoliolate leaves.
2. An ornament, symbol, or architectural form having the appearance of a trifoliolate leaf.
1. (Plants) any of numerous leguminous plants of the temperate genus Trifolium, having leaves divided into three leaflets and dense heads of small white, yellow, red, or purple flowers
2. (Plants) any of various related plants having leaves divided into three leaflets, such as bird's-foot trefoil
3. (Botany) a leaf having three leaflets
4. (Architecture) architect an ornament in the form of three arcs arranged in a circle
[C14: from Anglo-French trifoil, from Latin trifolium three-leaved herb, from tri- + folium leaf]
tre•foil(ˈtri fɔɪl, ˈtrɛf ɔɪl)
2. any of various plants having three leaflets resembling those of clover.
3. a three-lobed flower or leaf.
4. an architectural ornament composed of three lobes, separated by cusps, radiating from a common center.
5. any three-lobed figure, design, or emblem resembling a clover leaf.
[1350–1400; Middle English < Anglo-French trifoil < Latin trifolium triple leaf]
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|Noun||1.||trefoil - any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves|
herb, herbaceous plant - a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
Medicago arborea, moon trefoil - evergreen shrub of southern European highlands having downy foliage and a succession of yellow flowers throughout the summer followed by curious snail-shaped pods
Medicago falcata, sickle alfalfa, sickle lucerne, sickle medick - European medic naturalized in North America having yellow flowers and sickle-shaped pods
Calvary clover, Medicago echinus, Medicago intertexta - an annual of the Mediterranean area having spiny seed pods and leaves with dark spots
black medick, hop clover, Medicago lupulina, nonesuch clover, yellow trefoil - prostrate European herb with small yellow flowers and curved black pods; naturalized in North America
|2.||trefoil - a plant of the genus Trifolium |
lesser yellow trefoil, Trifolium dubium, hop clover, shamrock - clover native to Ireland with yellowish flowers; often considered the true or original shamrock
crimson clover, Italian clover, Trifolium incarnatum - southern European annual with spiky heads of crimson flower; extensively cultivated in United States for forage
purple clover, red clover, Trifolium pratense - erect to decumbent short-lived perennial having red-purple to pink flowers; the most commonly grown forage clover
dutch clover, shamrock, Trifolium repens, white clover - creeping European clover having white to pink flowers and bright green leaves; naturalized in United States; widely grown for forage
|3.||trefoil - an architectural ornament in the form of three arcs arranged in a circle|
architectural ornament - (architecture) something added to a building to improve its appearance