ortho-

views updated Jun 11 2018

ortho- • comb. form 1. straight; rectangular; upright: orthodontics. ∎  right; correct: orthoepy.2. Chem. 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. Chem. denoting a compound from which a meta-compound is formed by dehydration: orthophosphoric acid.

The Oxford Pocket Dictionary of Current English

ortho-

views updated May 29 2018

ortho- before a vowel orth-, comb. form of Gr. orthós straight, right, correct. orthoepy correct pronunciation. XVII. — Gr. orthoépeia (épos word). orthography correct spelling. XV. — (O)F. — L. — Gr.

The Concise Oxford Dictionary of English Etymology T. F. HOAD

ortho-

views updated May 29 2018

ortho- From the Greek orthos, meaning ‘straight’, a prefix meaning ‘straight’, ‘rectangular’, or ‘correct’.

A Dictionary of Ecology MICHAEL ALLABY

ortho-

views updated May 14 2018

ortho- A prefix meaning ‘straight’, ‘rectangular’, or ‘correct’, derived from the Greek orthos, ‘straight’.

A Dictionary of Zoology MICHAEL ALLABY

ortho-

views updated May 18 2018

ortho- combining form denoting
1. straight.

2. normal.

A Dictionary of Nursing

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