1. (Science: botany) 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.
2. An ornamental foliation consisting of three divisions, or foils.
3. A charge representing the clover leaf.
Origin: L. Tres three – E. Foil leaf; cf. F. Frefle, It. Trifoglio, L. Trifolium. See Tri-, Foil leaf, and cf. Trifoly.