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.
- Any of various plants of the genera Trifolium, Lotus, and related genera of the pea family, having compound trifoliate leaves.
- An ornament, symbol, or architectural form having the appearance of a trifoliate leaf.