Etymology
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tarn (n.)

late 14c., mid-13c. in Anglo-Latin, from Old Norse tjörn "small mountain lake without visible tributaries," from Proto-Germanic *terno, perhaps originally "water hole" [Barnhart]. A dialectal word popularized by the Lake poets.

updated on January 15, 2014

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Definitions of tarn from WordNet

tarn (n.)
a mountain lake (especially one formed by glaciers);
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.