hypocarpium

from The Collaborative International Dictionary of English v.0.48
Hypocarp \Hy"po*carp\, Hypocarpium \Hy`po*car"pi*um\, n. [NL.
   hypocarpium, fr. Gr. "ypo` beneath + ? fruit.] (Bot.)
   A fleshy enlargement of the receptacle, or for the stem,
   below the proper fruit, as in the cashew. See Illust. of
   {Cashew}.
   [1913 Webster]
    

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