Trefoil

Any plant of the genus Trifolium, which includes the white clover, red clover, etc.; -- less properly, applied also to the nonesuch, or black medic. See Clover, and Medic.

An ornamental foliation consisting of three divisions, or foils.

A charge representing the clover leaf.

a plant of the genus Trifolium

any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves

an architectural ornament in the form of three arcs arranged in a circle