Source : Webster's Revised Unabridged Dictionary (1913)

Heroine \Her"o*ine\, n. [F. h['e]ro["i]ne, L. heroina, Gr. ?,
   fem. of ?. See {Hero}.]
   1. A woman of an heroic spirit.

            The heroine assumed the woman's place. --Dryden.

   2. The principal female person who figures in a remarkable
      action, or as the subject of a poem or story.

Source : WordNet®

heroine
     n 1: the main good female character in a work of fiction
     2: a woman possessing heroic qualities or a woman who has
        performed heroic deeds