The Collaborative International Dictionary of English v.0.48:

Altruistic \Al`tru*is"tic\, a. [Cf. F. altruiste, a. See
   Altruism..]
   Regardful of others; beneficent; unselfish; -- opposed to
   egoistic or selfish. --Bain. -- Al`tru*is"tic*al*ly,
   adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

altruistic
    adj 1: showing unselfish concern for the welfare of others [syn:
           altruistic, selfless] [ant: egocentric, egoistic,
           egoistical, self-centered, self-centred]