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[grah-buh n] /ˈgrɑ bən/
a portion of the earth's crust, bounded on at least two sides by faults, that has dropped downward in relation to adjacent portions.
Also called rift valley.
Compare horst.
Origin of graben
1895-1900; < German: ditch Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for graben


an elongated trough of land produced by subsidence of the earth's crust between two faults
Word Origin
C19: from German, from Old High German graban to dig
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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graben in Science
A usually elongated block of rock that is bounded by parallel geologic faults along its two longest sides, and has a lower elevation than the rock at its sides. Grabens form where rock is being pulled apart by tectonic forces. The East African Rift Valley is a graben.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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