a. Bot. [f. Gr. τρίφυλλ-ος (f. τρι-, TRI- + φύλλον leaf) + -OUS.] Having or consisting of three leaves; spec. of a calyx or corolla, trisepalous or tripetalous.
1760. J. Lee, Introd. Bot., II. xxxii. (1765), 156. Ranunculus, with a triphyllous Calyx and polypetalous.
1763. Ehret, in Phil. Trans., LIII. 82. At the base of this broad petal is situated an irregular unequal-divided triphyllous periantheum.
1866. Treas. Bot., 1173. Triphyllous, having the leaves in a whorl of three; also, having only three leaves.
