Etymology
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birder (n.)

"bird-watcher," 1945, from bird (n.1) + -er (1). Earlier it meant "bird-catcher" (late 15c.).

updated on June 02, 2017

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Definitions of birder from WordNet

birder (n.)
a person who identifies and studies birds in their natural habitats;
Synonyms: bird watcher
From wordnet.princeton.edu, not affiliated with etymonline.