Source : Webster's Revised Unabridged Dictionary (1913)

Juggernaut \Jug"ger*naut`\, n. [Skr. jagann[=a]tha lord of the
   world.]
   One of the names under which Vishnu, in his incarnation as
   Krishna, is worshiped by the Hindoos. [Written also
   {Juggernnath}, {Jaganath}, {Jaganatha}, etc.]

   Note: The principal seat of the worship of Juggernaut is at
         P[^u]ri in Orissa. At certain times the idol is drawn
         from the temple by the multitude, on a high car with
         sixteen wheels. Formerly, fanatics sometimes threw
         themselves under the wheels to be crushed as a
         sacrifice to the god.