Definition of ortho- in English:

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ortho-

Pronunciation:

combiningForm

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

Origin

From Greek orthos 'straight, right'.

For editors and proofreaders

Syllabification: ortho-

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