The Collaborative International Dictionary of English v.0.48:

Actress \Ac`tress\, n. [Cf. F. actrice.]
   1. A female actor or doer. [Obs.] --Cockeram.
      [1913 Webster]

   2. A female stageplayer; a woman who acts a part.
      [1913 Webster]

WordNet (r) 3.0 (2006):

actress
    n 1: a female actor

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "actress":
   Roscius, actor, antagonist, bad guy, barnstormer, character,
   character actor, character man, character woman, child actor,
   diseur, diseuse, dramatizer, feeder, foil, heavy, histrio,
   histrion, ingenue, juvenile, matinee idol, mime, mimer, mimic,
   monologist, mummer, pantomime, pantomimist, playactor, player,
   protean actor, reciter, soubrette, stage performer, stage player,
   stooge, straight man, stroller, strolling player, theatrical,
   thespian, trouper, utility man, villain