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ornithology
ornithomancy
ornithophily
ornithopod
ornithopter
ornithosis
oro-
orogenesis
orogenic
orogenic belt
orogeny
orography
oroide
orology
OROM
Oromo
Orono
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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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