krypton (n.) Look up krypton at
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."