Definition of ornithology noun from the Oxford Advanced American Dictionary

 

ornithology

 noun
noun
NAmE//ˌɔrnəˈθɑlədʒi//
 
[uncountable]
 
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the scientific study of birds
ornithological
 
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NAmE//ˌɔrnəθəˈlɑdʒɪkl//
 
adjective
See the Oxford Advanced Learner's Dictionary entry: ornithology