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actinon

[ak-tuh-non]
noun Chemistry.
  1. a chemically inert, gaseous, short-lived isotope of radon that is a member of the actinium series. Symbol: An; atomic number: 86; atomic weight: 219.
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Origin of actinon

From New Latin, dating back to 1925–30; see origin at actinium, -on2
Also called actinium emanation.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for actinon

actinon

noun
  1. a radioisotope of radon that is a decay product of radium. Symbol: An or 219 Rn; atomic no: 86; half-life: 3.92s
  2. another name for actinide
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Word Origin

C20: New Latin, from actinium + -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