Source : Webster's Revised Unabridged Dictionary (1913)

Perianth \Per"i*anth\, n. [Pref. peri- + Gr. ? flower: cf. F.
   p['e]rianthe.] (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}.

Source : WordNet®

perianth
     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}]