The Collaborative International Dictionary of English v.0.48:

Stamen \Sta"men\ (st[=a]"m[e^]n), n.; pl. E. Stamens
   (-m[e^]nz) (used only in the second sense); L. Stamina
   (st[a^]m"[i^]*n[.a]) (in the first sense). [L. stamen the
   warp, a thread, fiber, akin to Gr. sth`mwn the warp, fr.
   'ista`nai to stand, akin to E. stand. See Stand, and cf.
   Stamin, Stamina.]
   1. A thread; especially, a warp thread.
      [1913 Webster]

   2. (pl. Stamens, rarely Stamina.) (Bot.) The male organ
      of flowers for secreting and furnishing the pollen or
      fecundating dust. It consists of the anther and filament.
      [1913 Webster]

WordNet (r) 3.0 (2006):

stamen
    n 1: the male reproductive organ of a flower

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "stamen":
   androecium, anther, calyx, carpel, corolla, corolla tube, corona,
   epicalyx, gynoecium, megasporophyll, microsporophyll, perianth,
   petal, pistil, receptacle, stigma, style, torus