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ornithopod
ornithopter
ornithosis
oro-
orogenesis
orogenic
orogenic belt
orogeny
orography
oroide
orology
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orography
o·rog·ra·phy [ aw róggrəfee ]


noun 
Definition:
 
study of mountains: the branch of physical geography involved with the study and mapping of variations in the Earth's surface, including mountains and mountain ranges
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