‖n. pl. [ NL., fr. Gr. &unr_; twenty +&unr_;, &unr_;, man, male: cf. F. icosandrie. ] (Bot.) A Linnæan class of plants, having twenty or more stamens inserted in the calyx.

{ } a. (Bot.) Pertaining to the class Icosandria; having twenty or more stamens inserted in the calyx. [ 1913 Webster ]