Dictionary

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

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