• synonyms


noun Geology.
  1. a long, narrow or oval, smoothly rounded hill of unstratified glacial drift.
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Origin of drumlin

1825–35; drum2 + -lin, variant of -ling1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for drumlin

Historical Examples of drumlin

  • A drumlin is seen, at Great Head, Winthrop, being undermined and worn away by the waves.

    Appletons' Popular Science Monthly, September 1899


British Dictionary definitions for drumlin


  1. a streamlined mound of glacial drift, rounded or elongated in the direction of the original flow of ice
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Word Origin for drumlin

C19: from Irish Gaelic druim ridge + -lin -ling 1
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

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."

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Online Etymology Dictionary, © 2010 Douglas Harper

drumlin in Science


  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.