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orogenic
orogenic belt
orogeny
orography
oroide
orology
OROM
Oromo
Orono
Orontes
oropendola
oropharynx
orotund
Oroya fever
orphan
orphan assets
orphan site
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ornithology

or·ni·thol·o·gy [ àwrnə thólləjee ]


noun 
Definition:
 
study of birds: the branch of zoology that deals with the scientific study of birds


or·ni·tho·log·i·cal [ àwrnəthə lójjik'l ] adjective
or·ni·tho·log·i·cal·ly [ àwrnəthə lójjikəlee ] adverb
or·ni·thol·o·gist [ àwrnə thólləjist ] noun
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