ortho-
ortho-
1. word element [Gr.], straight; normal; correct.
2. in organic chemistry, a prefix indicating a cyclic derivative having two substituents in adjacent positions. Symbol o-. 
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Examples of benzene derivatives with substituents in the ortho- position. (A), o -xylene (1,2-dimethylbenzene); (B), o -nitrophenol.
3. in organic chemistry, the common form of an acid.
| ortho- or orth- pref. 1. Straight; upright; vertical: orthotropic. 2. Correct; correction: orthopsychiatry. 3. Hydrated form of an acid or of its salts: orthoboric acid. 4. Diatomic molecules in which the nuclei have the same direction of spin: orthohydrogen. 5. Abbr. o- Of or relating to one of three possible isomers of a benzene ring with adjacent carbon atoms having attached chemical groups: ortho-dibromobenzene. |
ortho-
[ôr′thə-]
prefix meaning "straight, normal, correct": orthobiosis, orthodontist, orthotopic.
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