American English

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

 

ortho-

 combining form
combining form
NAmE//ˈɔrθoʊ//
 
, NAmE//ˈɔrθə//
 
 
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(in nouns, adjectives, and adverbs) correct; standard orthodox orthography
See the Oxford Advanced Learner's Dictionary entry: ortho-