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ornithophily
ornithopod
ornithopter
ornithosis
oro-
orogenesis
orogenic
orogenic belt
orogeny
orography
oroide
orology
OROM
Oromo
Orono
Orontes
oropendola
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orogeny
o·rog·e·ny [ aw rójjənee ]


noun 
Definition:
 
process of mountain formation: the folding, faulting, and uplift of the Earth's crust to form mountain ranges, often accompanied by volcanic and seismic activity
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