ortho-

prefix

straight, right, proper / (chemistry) Having an extra proportion of water

The orthodontist recommended braces to straighten my teeth.

意味（1）

straight, right, proper

意味（2）

(chemistry) Having an extra proportion of water

意味（3）

(organic chemistry) in isomeric benzene derivatives, having the two substituents in adjacent (1,2) positions (compare meta- and para-)

意味（4）

(physics) of any molecule of the form X₂ in which the two nuclei have parallel spin