Per·i·anth n. Bot. (a) The leaves of a flower generally, especially when the calyx and corolla are not readily distinguished. (b) A saclike involucre which incloses the young fruit in most hepatic mosses. See Illust. of Hepatica.
n : collective term for the outer parts of a flower consisting
of the calyx and corolla and enclosing the stamens and
pistils [syn: chlamys, floral envelope, perigone, perigonium]