orth-
combining form
variants
or ortho-
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
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Merriam-Webster unabridged
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