Definition of ornithological adjective from the Oxford Advanced Learner's Dictionary

 

ornithological

 adjective
adjective
BrE BrE//ˌɔːnɪθəˈlɒdʒɪkl//
 
; NAmE NAmE//ˌɔːrnɪθəˈlɑːdʒɪkl//
 
 
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connected with the scientific study of birds ornithological research