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Noun trefoil has 3 senses
  1. medic, medick, trefoil - any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves
    --1 is a kind of herb, herbaceous plant
    --1 is a member of Medicago, genus Medicago
    --1 has particulars:
     moon trefoil, Medicago arborea; sickle alfalfa, sickle lucerne, sickle medick, Medicago falcata; Calvary clover, Medicago intertexta, Medicago echinus; black medick, hop clover, yellow trefoil, nonesuch clover, Medicago lupulina; alfalfa, lucerne, Medicago sativa
  2. clover, trefoil - a plant of the genus Trifolium
    --2 is a kind of herb, herbaceous plant
    --2 is a member of Trifolium, genus Trifolium
    --2 has particulars:
     alpine clover, Trifolium alpinum; hop clover, shamrock, lesser yellow trefoil, Trifolium dubium; crimson clover, Italian clover, Trifolium incarnatum; red clover, purple clover, Trifolium pratense; buffalo clover, Trifolium reflexum; white clover, dutch clover, shamrock, Trifolium repens; buffalo clover, Trifolium stoloniferum
  3. trefoil - an architectural ornament in the form of three arcs arranged in a circle
    --3 is a kind of     architectural ornament
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