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Meaning of graben

gra•ben

Pronunciation: (grä'bun), [key]
— n.
  1. 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 calledCf. horst.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.