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ortho-
- straight, regular, upright: orthognathous
- at right angles, perpendicular: orthorhombic
- proper, correct, standard: orthography
- Chem.: usually italicized and hyphenated in chemical names: ortho-aminobenzoic acid
- that acid (of a group containing the same nonmetallic element) which has the largest number of OH groups per atom of the nonmetal: orthophosphoric acid
- characterized by substitutions in the 1, 2 position in the benzene ring
- Med. correction of deformities: orthopedics
See ortho- in American Heritage Dictionary 4
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