oro-, oreo-, ore-, oreino-, orein- (Greek > Latin: mountain; hill).oread: 
oreodon: 
oreodont: 
oreodoxa: 
oreograph: 
oreography: 
oreosoma: 
orobathymetric: 
orocratic: 
orogen: 
orogenesis: 
orogenetic: 
orogenic: 
orogeny: 
orographic: 
orographical: 
orography: 
Orohippus: 
orohippus: 
orohydrography: 
orohylile: 
orological: 
orologist: 
orology: 
orometer: 
orometric: 
orophile: 
orophilous: 
orophily: 
orophytes: 
Orophyticoreodoxa: 
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