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[es-ker] /ˈɛs kər/
noun, Geology.
a serpentine ridge of gravelly and sandy drift, believed to have been formed by streams under or in glacial ice.
Origin of esker
First recorded in 1850-55, esker is from the Irish word eiscir ridge of mountains Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for esker


a long winding ridge of gravel, sand, etc, originally deposited by a meltwater stream running under a glacier Also called os
Word Origin
C19: from Old Irish escir ridge
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for esker

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

Online Etymology Dictionary, © 2010 Douglas Harper
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esker in Science
A long, narrow, steep-sided ridge of coarse sand and gravel deposited by a stream flowing in or under a melting sheet of glacial ice. Eskers range in height from 3 m (9.8 ft) to more than 200 m (656 ft) and in length from less than 100 m (328 ft) to more than 500 km (310 mi).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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