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trefoil (n.)

late 14c., type of clover, from Anglo-French trifoil (13c.), Old French trefueil "clover, clover-leaf," from Latin trifolium "three-leaved plant," from tri- "three" (see tri-) + folium "leaf" (from PIE root *bhel- (3) "to thrive, bloom"). As a type of ornamental figure in medieval architecture, early 15c.

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Definitions of trefoil from WordNet

trefoil (n.)
any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves;
Synonyms: medic / medick
trefoil (n.)
a plant of the genus Trifolium;
Synonyms: clover
trefoil (n.)
an architectural ornament in the form of three arcs arranged in a circle;
From wordnet.princeton.edu