The Collaborative International Dictionary of English v.0.48:

Gynoecium \Gy*n[oe]"ci*um\ (j[i^]*n[=e]"s[i^]*[u^]m or
   -sh[i^]*[u^]m), n. [NL., fr. Gr. gynh` a woman + o'i^kos
   house.] (Bot.)
   The pistils of a flower, taken collectively. See Illust. of
   Carpophore.
   [1913 Webster]

WordNet (r) 3.0 (2006):

gynoecium
    n 1: a female gametoecium