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orogenesis
orogenic
orogenic belt
orogeny
orography
oroide
orology
OROM
Oromo
Orono
Orontes
oropendola
oropharynx
orotund
Oroya fever
orphan
orphan assets
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ornitho-
ornitho-


prefix 
Definition:
 
bird
ornithology
[< Greek ornith-, stem of ornis "bird"]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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