Definitions from Wiktionary (trefoil)

▸ noun:  Any of several plants of the pea family, having compound, trifoliate leaves; especially one of the genus Trifolium.
▸ noun:  A symbol having the shape of such leaves, especially when used as an architectural ornament.
▸ noun:  (topology) Ellipsis of trefoil knot. [(topology) A knot formed by joining the two loose ends of a overhand knot to form a knotted loop; the simplest non-trivial knot.]
▸ Also see trefoil




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