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2017 Word of the Year

thoron

[thawr-on, thohr-] /ˈθɔr ɒn, ˈθoʊr-/
noun, Chemistry.
1.
a radioactive isotope of radon, produced by the disintegration of thorium. Symbol: Tn; atomic weight: 220; atomic number: 86.
Origin of thoron
1925-1930
First recorded in 1925-30; thor(ium) + -on2
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for thoron
Historical Examples
  • But the crusaders embarrassed themselves with the siege of the castle of thoron.

    The History of Chivalry G. P. R. James
British Dictionary definitions for thoron

thoron

/ˈθɔːrɒn/
noun
1.
a radioisotope of radon that is a decay product of thorium. Symbol: Tn or 220Rn; atomic no: 86; half-life: 54.5s
Word Origin
C20: from thorium + -on
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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9
9
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