英语释义
1. straight upright vertical
orthograde
2. perpendicular
orthorhombic
3. correct corrective
orthodontia
4. hydrated or hydroxylated to the highest degree
orthophosphoric acid
5. involving substitution at or characterized by or having the relationship of two neighboring positions in the benzene ring
ortho-xylene
6. involving substitution at or characterized by or having the relationship of two neighboring positions in the benzene ring —abbreviation o-
ortho-xylene or o-xylene — compare meta- sense 2, para- sense 2