a. Bot. [f. mod.L. tetrapetalus (f. Gr. τετρα- four- + πέταλον PETAL) + -OUS.] Having four petals.
1697. Phil. Trans., XIX. 435. A wonderful strange Heath-leaf’d Tetrapetalous … Plant.
1704. J. Harris, Lex. Techn., I. Tetrapetalous Flower … is that which consists of but four single coloured Leaves (which the Botanists call Petala).
1837. Keith, Bot. Lex., 80. If the petals of a tetrapetalous corolla are so disposed on their receptacle as to spread out in the form of a cross, they are said to be cruciform.
