gra·ben (grä b n)n. A usually elongated depression between geologic faults. [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 (gräbn) 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. |
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