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[druhm-lin] /ˈdrʌm lɪn/
noun, Geology.
a long, narrow or oval, smoothly rounded hill of unstratified glacial drift.
Origin of drumlin
1825-35; drum2 + -lin, variant of -ling1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for drumlin


a streamlined mound of glacial drift, rounded or elongated in the direction of the original flow of ice
Word Origin
C19: from Irish Gaelic druim ridge + -lin-ling1
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 drumlin

1833, diminutive of drum (1725) "ridge or long, narrow hill," often separating two parallel valleys, from Gaelic and Irish druim "back, ridge."

Online Etymology Dictionary, © 2010 Douglas Harper
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drumlin in Science

An extended, oval hill or ridge of compacted sediment deposited and shaped by a glacier. Drumlins are typically about 30 m (98 ft) high and are longer than they are wide. They have one steep and one gentle slope along their longest axis, which is parallel to the direction of the glacier's movement. The steepest slope faces the direction from which the glacier originated, and the gentler slope faces the direction in which the glacier was advancing.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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