Eskers

esker

[es-ker]
noun Geology.
a serpentine ridge of gravelly and sandy drift, believed to have been formed by streams under or in glacial ice.

Origin:
1850–55; < Irish eiscir ridge of mountains

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World English Dictionary
esker or eskar (ˈɛskə, ˈɛskɑː, -kə)
 
n
Also called: os a long winding ridge of gravel, sand, etc, originally deposited by a meltwater stream running under a glacier
 
[C19: from Old Irish escir ridge]
 
eskar or eskar
 
n
 
[C19: from Old Irish escir ridge]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

esker
"deposit left by a glacial stream," 1852, from Ir. eiscir "ridge of gravel."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
esker   (ěs'kər)  Pronunciation Key 
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).
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