Definition of hetero- combining form from the Oxford Advanced American Dictionary

 

hetero-

 combining form
combining form
NAmE//ˈhɛt̮əroʊ//
 
, NAmE//ˈhɛt̮ərə//
 
 
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(in nouns, adjectives, and adverbs) other; different heterogeneous heterosexual compare homo-
See the Oxford Advanced Learner's Dictionary entry: hetero-