Trefoil(n.) 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.
Trefoil(n.) An ornamental foliation consisting of three divisions, or foils.
Trefoil(n.) A charge representing the clover leaf.
Trefoiled(a.) Same as Trefle.

Words within trefoils