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orthopedics
orthophosphate
orthophosphoric acid
orthopsychiatry
orthopteran
orthopterous
orthoptics
orthopyroxene
orthorhombic
orthoscopic
orthostatic
orthotics
orthotropic
orthotropous
orthovoltage
orthovoltage therapy
ortolan
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ortho-

ortho-


prefix 
Definition:
 
1. correct; correction, straightening
orthography
orthodontics

2. straight, upright, vertical
orthotropous

3. perpendicular
orthorhombic

4. fully hydrated or hydroxylated
orthophosphate

[Via French and Latin< Greek orthos "straight, right"]
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