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krypton (n.)

inert gaseous element, 1898, coined by its discoverers (Sir William Ramsay and Morris W. Travers) from Greek krypton, neuter of adjective kryptos "hidden" (see crypt); so called because it remained undiscovered for so long and was so difficult to find. "Scientific American" (July 9, 1898) announced it as "the discovery of yet another element."

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Definitions of krypton from WordNet

krypton (n.)
a colorless element that is one of the six inert gasses; occurs in trace amounts in air;
Synonyms: Kr / atomic number "
From wordnet.princeton.edu