[ grä] ′bən graben definition by Webster's New World
a relatively long, narrow area of the earth's crust that has subsided between two bordering faults
Origin: German a ditch ; from Old High German grabo ; from graban, to dig: see grave Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
graben definition by American Heritage Dictionary
A usually elongated depression between geologic faults.
Origin: German Graben, from Middle High German grabe, trench, from Old High German grabo, from graban, to dig; see ghrebh- 2 in Indo-European roots. graben The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. graben - Science Definition
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.