The Collaborative International Dictionary of English v.0.48:

Basigynium \Ba`si*gyn"i*um\, n. [NL., fr. Gr. ba`sis base +
   gynh` woman.] (Bot.)
   The pedicel on which the ovary of certain flowers, as the
   passion flower, is seated; a carpophore or thecaphore.
   [1913 Webster]