1Straight; rectangular; upright.‘orthodontics’
- 1.1Right; correct.‘orthoepy’
- 1.1Right; correct.
Denoting substitution at two adjacent carbon atoms in a benzene ring, e.g., in 1, 2 positions.‘orthodichlorobenzene’Compare with meta- and para-
Denoting a compound from which a meta-compound is formed by dehydration.‘orthophosphoric acid’
From Greek orthos straight, right.