Etymology
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ornithologist (n.)

"one who makes a special study of birds," 1670s, from ornithology + -ist.

updated on October 01, 2019

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Definitions of ornithologist from WordNet

ornithologist (n.)
a zoologist who studies birds;
Synonyms: bird watcher
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.