English

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

 

ortho-

 combining form
combining form
BrE BrE//ˈɔːθəʊ//
 
; NAmE NAmE//ˈɔːrθoʊ//
 
 
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(in nouns, adjectives and adverbs) correct; standard orthodox orthography Word Originfrom Greek orthos ‘straight, right’.
See the Oxford Advanced American Dictionary entry: ortho-