Definition of krypton
English to English noun - a colorless element that is one of the six inert gasses; occurs in trace amounts in air
source: WordNet 3.0 - An inert gaseous element of the argon group, occurring in air to the extent of about one volume in a million. It was discovered by Ramsay and Travers in 1898. Liquefying point, -- 152° C.; symbol, Kr; atomic weight, 83.0.
source: Webster 1913
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