[gra.ben] n [G, ditch, fr. OHG grabo, fr. graban to dig--more at grave] (1896): a depressed segment of the crust of the earth or a celestial body (as the moon) bounded on at least two sides by faults
GRABEN
Meaning of GRABEN in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012