Krn.
/ˌkeɪˈɑː/, U.S. /ˌkeɪˈɑr/ Chemistry.
The element krypton.
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Kr1898
krypton1898
1898 W. Ramsay & M. W. Travers in Nature 9 June 128/1 If this conclusion turns out to be well substantiated, we propose to call it ‘krypton’, or ‘concealed’. Its symbol would then be Kr.
1931 Standards Yearbk. (U.S. Dept. Commerce) 230 The wave lengths of the stronger lines of Kr and Xe have been compared with neon standards by interferometer methods.
1965 C. S. G. Phillips & R. J. P. Williams Inorg. Chem. I. xii. 445 Until 1962 it was thought that the noble gases formed no true compounds. However, fluorides of Kr, Xe, and Rn have now been discovered.
2013 Jrnl. Environmental Radioactivity 115 34/1 85Kr is produced by fission of uranium or plutonium in nuclear reactors.
This is a new entry (OED Third Edition, December 2013; most recently modified version published online March 2022).
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