trefoil

noun

Any of several plants of the pea family, having compound, trifoliate leaves; especially one of the genus Trifolium.

The trefoil is a common plant found in meadows and fields.

意味（1）

Any of several plants of the pea family, having compound, trifoliate leaves; especially one of the genus Trifolium.

意味（2）

A symbol having the shape of such leaves, especially when used as an architectural ornament.

意味（3）

(topology) Ellipsis of trefoil knot..