Dictionary.com

thoron

[ thawr-on, thohr- ]
/ ˈθɔr ɒn, ˈθoʊr- /

noun Chemistry.

a radioactive isotope of radon, produced by the disintegration of thorium. Symbol: Tn; atomic weight: 220; atomic number: 86.

QUIZZES

GEE WHILLIKERS! WAIT TILL YOU SEE THIS WORD OF THE DAY QUIZ!

Do you remember all the words from last week, September 21–27, 2020? Then this quiz should be butyraceous.
Question 1 of 7
What does “yare” mean?
quick; agile; lively.
expressive of or characterized by sorrow.
having or characterized by persistent or earnest desire.
TAKE THE QUIZ TO FIND OUT

Origin of thoron

First recorded in 1925–30; thor(ium) + -on2

Words nearby thoron

thorn moth, Thornton, thorny, thoro, Thorold, thoron, thorough, thorough bass, thorough brace, thoroughbred, thoroughfare
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for thoron

  • 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

a radioisotope of radon that is a decay product of thorium. Symbol: Tn or 220 Rn; atomic no: 86; half-life: 54.5s

Word Origin for thoron

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