[al-troo-is-tik] 
| 1. | unselfishly concerned for or devoted to the welfare of others (opposed to egoistic ). |
| 2. | Animal Behavior. of or pertaining to behavior by an animal that may be to its disadvantage but that benefits others of its kind, often its close relatives. |
| al·tru·ism (āl'trōō-ĭz'əm) n.
[French altruisme, probably from Italian altrui, someone else, from Latin alter, other; see al-1 in Indo-European roots.] al'tru·ist n., al'tru·is'tic adj., al'tru·is'ti·cal·ly adv. |
truˈɪs