orth-

orth-

combining form

Definition of ORTH-

1

: straight : upright : vertical <orthograde>

2

: perpendicular <orthorhombic>

3

: correct : corrective <orthodontia>

4

a : hydrated or hydroxylated to the highest degree <orthophosphoric acid> b : involving substitution at or characterized by or having the relationship of two neighboring positions in the benzene ring <ortho-xylene>

Variants of ORTH-

orth- or ortho-

Origin of ORTH-

Greek, from orthos straight, right, true; akin to Sanskrit ūrdhva high, upright