eighth avatar of Vishnu, 1875, from Skt. krshnah, lit. "the Black One," from PIE *kers-no-, suffixed form of base *kers- "dark, dirty" (cf. O.C.S. crunu, Rus. coron, Serbo-Cr. crn, Czech cerny, O.Prus. krisnas "black," Lith. kersas "black and white, variegated").