The Collaborative International Dictionary of English v.0.48:

Hypogynous \Hy*pog"y*nous\, a. [Pref. hypo- + Gr. ? woman,
   female: cf. F. hypogyne.] (Bot.)
   Inserted below the pistil or pistils; -- said of sepals,
   petals, and stamens; having the sepals, petals, and stamens
   inserted below the pistil; -- said of a flower or a plant.
   --Gray.
   [1913 Webster]