Rus. definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Rus. definition by American Heritage Dictionary
The medieval Russian state, established c. 862 by Scandinavian traders and warriors led by Rurik, who founded a dynasty at Novgorod. In 882 his successor moved the capital to Kiev, the center of Kievan Russia.
Origin: Russian Rus', from Old Russian Rusĭ, group of Vikings, Rus; see Russian.