Ortho is defined as straight.
An example of ortho used as a prefix is in the word orthodontist.
Straight; upright; vertical.
The most fully hydrated form of an acid or of its salts.
Of or relating to one of three possible isomers of a benzene ring with two attached chemical groups in which the carbon atoms with attached groups are adjacent.
Straight, regular, upright.
At right angles, perpendicular.
Proper, correct, standard.
Correction of deformities.
That acid (of a group containing the same nonmetallic element) which has the largest number of OH groups per atom of the nonmetal.
Characterized by substitutions in the 1, 2 position in the benzene ring.
(chemistry) Having an extra proportion of water.
Origin of ortho
Middle English from Old French from Latin from Greek from orthos straight, correct, right