Hy'po·carpHy`po*car'pi*um noun [ New Latin hypocarpium , from Greek 'ypo` beneath + ... fruit.] (Botany) A fleshy enlargement of the receptacle, or for the stem, below the proper fruit, as in the cashew. See Illust. of Cashew . Found on http://www.encyclo.co.uk/webster/H/82