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Pronunciation: /ˈɔːθəʊ/

Definition of ortho- in English:


1.1Right; correct: orthoepy
2 Chemistry Denoting substitution at two adjacent carbon atoms in a benzene ring, e.g. in 1,2 positions: orthodichlorobenzene Compare with meta- and para-1.
3 Chemistry Denoting a compound from which a meta-compound is formed by dehydration: orthophosphoric acid


From Greek orthos 'straight, right'.

Definition of ortho- in:
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