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

ornithologist

noun
 
/ˌɔːnɪˈθɒlədʒɪst/
 
/ˌɔːrnɪˈθɑːlədʒɪst/
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  1. a person who studies birds compare birdwatcher
See ornithologist in the Oxford Advanced American Dictionary
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