Webster's English Dictionary

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perianth

peri.anth \'per-e--.an(t)th\ \-.an(t)s, -.an(t)ths\ n or perianths [NL 
   perianthium, fr. peri- + Gk anthos flower - more at ] pl ANTHOLOGY : the 
   external envelope of a flower esp. when not differentiated into caly x and 
   corolla