Etymology
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esker (n.)

"deposit left by a glacial stream," 1852, from Irish eiscir "ridge of gravel."

updated on January 07, 2013

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Definitions of esker from WordNet

esker (n.)
(geology) a long winding ridge of post glacial gravel and other sediment; deposited by meltwater from glaciers or ice sheets;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.