WordReference Random House Unabridged Dictionary of American English © 2020
Bif•rost  (bivrost),USA pronunciation n. [Scand. Myth.]
  1. Mythologythe rainbow bridge of the gods from Asgard to earth.
  • Old Norse Bifrǫst, equivalent. to bif- (root of bifa, cognate with Old English bifian to shake) + rǫst, cognate with Old High German rasta stretch of road

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