The Collaborative International Dictionary of English v.0.48:

Anther \An"ther\, n. [F. anth[`e]re, L. anthera a medicine
   composed of flowers, fr. Gr. ? flowery, fr. 'anqei^n to
   bloom, 'a`nqos flower.] (Bot.)
   That part of the stamen containing the pollen, or fertilizing
   dust, which, when mature, is emitted for the impregnation of
   the ovary. -- An"ther*al, a.
   [1913 Webster]

WordNet (r) 3.0 (2006):

anther
    n 1: the part of the stamen that contains pollen; usually borne
         on a stalk