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thoron

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tho⋅ron

  [thawr-on, thohr-]
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–noun Chemistry.
a radioactive isotope of radon, produced by the disintegration of thorium. Symbol: Tn; atomic weight: 220; atomic number: 86.
Origin:
1925–30; thor(ium) + -on 2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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tho·ron   (thôr'ŏn', thōr'-)   
n.  A radioactive isotope of radon, Rn 220, having a half-life of 54.5 seconds and produced by the disintegration of thorium.

[thor(ium) + -on2.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: tho·ron
Pronunciation: 'thO(&)r-"än, 'tho(&)r-
Function: noun
: a heavy radioactive isotope of radon of mass number 220 thatis formed as a decay product of thorium, decays by emission of an alpha particle, and has a half-life of less than a minute
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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