Real Dictionary

xenon in American English
a heavy, colorless, gaseous chemical element, one of the noble gases, present in the air in minute quantities and found to react with fluorine and other reactive compounds and to form salts and acids in solution: used in bubble chambers, electric luminesc
noun: a heavy, colorless, chemically inactive, monatomic gaseous element used for filling radio, television, and luminescent tubes; at. wt.: 131.30; at. no.: 54

xenon in British English
noun: a colourless odourless element of the rare gas group, occurring in trace amounts in air; formerly considered inert it is now known to form compounds and is used in radio valves, stroboscopic and bactericidal lamps, and bubble chambers. Symbol: Xe; atomic