ornithology /ˌoɚnəˈθɑːləʤi/ noun Learner's definition of ORNITHOLOGY
[noncount]
: a branch of science that deals with the study of birds鸟类学
— ornithological
/ˌoɚnəθəˈlɑːʤɪkəl/ adjective — ornithologist
/ˌoɚnəˈθɑːləʤɪst/ noun, plural ornithologists [count]