ortho-

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ortho-

, orth-
1. Prefix denoting straight, normal, in proper order.
2. In chemistry, italicized prefix denoting that a compound has two substitutions on adjacent carbon atoms in a benzene ring. For terms beginning ortho- or o-, see the specific name.
3. The most hydrated of a series of oxoacids, for example, orthophosphoric acid, H3PO4.
[G. orthos, correct]

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-.
Enlarge picture
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-

[ôr′thə-]
prefix meaning "straight, normal, correct": orthobiosis, orthodontist, orthotopic.

ortho-

, orth-
1. Combining forms meaning straight, normal, in proper order.
2. chemistry Italicized prefix denoting that a compound has two substitutions on adjacent carbon atoms in a benzene ring. For terms beginning ortho- or o-, see the specific name.

ortho-

Combining form denoting straight, upright, corrective or normal.

ortho-

prefix denoting straight, upright, correct.

ortho-

, orth-
Combining forms meaning straight, normal, in proper order.