Definition of ornithology noun from the Oxford Advanced Learner's Dictionary

 

ornithology

 noun
noun
BrE BrE//ˌɔːnɪˈθɒlədʒi//
 
; NAmE NAmE//ˌɔːrnɪˈθɑːlədʒi//
 
[uncountable]
 
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the scientific study of birds Word Origin late 17th cent.: from modern Latin ornithologia, from Greek ornithologos ‘relating to birds’.
See the Oxford Advanced American Dictionary entry: ornithology