Hy·pan·thi·um n.; pl. L. Hypanthia E. Hypanthiums   Bot. A fruit consisting in large part of a receptacle, enlarged below the calyx, as in the Calycanthus, the rose hip, and the pear.
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  hypanthium
       n : the cuplike or ringlike or tubular structure of a flower
           which bears the sepals and stamens and calyx (as in
           Rosaceae) [syn: floral cup, calyx tube]
       [also: hypanthia (pl)]