Dictionary![]() ![]() RuhrPronunciation: (roor), [key] —n. 1. a river in W Germany, flowing NW and W into the Rhine. 144 mi. (232 km) long. 2. a mining and industrial region centered in the valley of the Ruhr River. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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