The Collaborative International Dictionary of English v.0.48:
Carpophore \Car"po*phore\, n. [Gr. karpo`s fruit + fe`rein to bear.] (Bot.) A slender prolongation of the receptacle as an axis between the carpels, as in Geranium and many umbelliferous plants. [1913 Webster]WordNet (r) 3.0 (2006):
carpophore n 1: a slender stalk that furnishes an axis for a carpel