/ Dictionary / Index A altruist: Meaning and Definition of Find definitions for: al•tru•ist Pronunciation: (al'tr-ist), [key] — n. a person unselfishly concerned for or devoted to the welfare of others (opposed to egoist). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: altruist (Thesaurus) altruism altruistic Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language