The Collaborative International Dictionary of English v.0.48:
anaphor \anaphor\ n. A word (such as a pronoun) used to avoid repetition; the referent of an anaphor is determined by its antecedent. [WordNet 1.5]WordNet (r) 3.0 (2006):
anaphor n 1: a word (such as a pronoun) used to avoid repetition; the referent of an anaphor is determined by its antecedent