Greek fire 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.
an incendiary material used in medieval warfare, described as able to burn in water
Origin: from its first use by Greeks of Byzantium
Greek fire definition by American Heritage Dictionary
An incendiary preparation first used by the Byzantine Greeks to set fire to enemy ships.