In'dus val'ley civiliza"tion
an ancient civilization that flourished in the Indus River valley, from about 2500 to 1500 b.c.: extensive archaeological excavations at the main sites of Mohenjo-Daro and Harappa in Pakistan. Also called Indus civilization.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.