from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A usually elongated depression between geologic faults.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An elongated block of the Earth's crust that has dropped relative to the surrounding blocks
- n. Plural form of graben.
from The Century Dictionary and Cyclopedia
- n. In geology, a trough-like area caused by the down-throw of a crustal fault-block.
German Graben, from Middle High German grabe, trench, from Old High German grabo, from graban, to dig.(American Heritage® Dictionary of the English Language, Fourth Edition)
Borrowing from German Graben ("ditch"), from the verb graben ("to dig"). (Wiktionary)