drumlin

[druhm-lin]
noun Geology.
a long, narrow or oval, smoothly rounded hill of unstratified glacial drift.

Origin:
1825–35; drum2 + -lin, variant of -ling1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To drumlin
Collins
World English Dictionary
drumlin (ˈdrʌmlɪn)
 
n
a streamlined mound of glacial drift, rounded or elongated in the direction of the original flow of ice
 
[C19: from Irish Gaelic druim ridge + -lin-ling1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Etymonline
Word Origin & History

drumlin
1833, dim. of drum (1725) "ridge or long, narrow hill," often separating two parallel valleys, from Gael. & Ir. druim "back, ridge."
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
American Heritage
Science Dictionary
drumlin   (drŭm'lĭn)  Pronunciation Key 


(click for larger image in new window)

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.
Cite This Source
Encyclopedia Britannica
Encyclopedia

drumlin

oval or elongated hill believed to have been formed by the streamlined movement of glacial ice sheets across rock debris, or till. The name is derived from the Gaelic word druim ("rounded hill," or "mound") and first appeared in 1833.

Learn more about drumlin with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source
Example sentences
The writer prefers to restrict the name drumlin to those drift hills which show clearly the molding effect of the advancing ice.
Soils in the drumlin are described as dense silty to gravelly loam.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature