Definition of hetero- combining form from the Oxford Advanced Learner's Dictionary

 

hetero-

 combining form
combining form
BrE BrE//ˈhetərəʊ//
 
; NAmE NAmE//ˈhetəroʊ//
 
 
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(in nouns, adjectives and adverbs) other; different heterogeneous heterosexual compare homo- Word Originfrom Greek heteros ‘other’.
See the Oxford Advanced American Dictionary entry: hetero-