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meitnerium

[mahyt-nur-ee-uh m] /maɪtˈnɜr i əm/
noun, Chemistry, Physics.
1.
a superheavy, synthetic, radioactive element. Symbol: Mt; atomic number: 109.
Formerly unnilennium, element 109.
Origin
named after Austrian physicist Lise Meitner; see -ium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for meitnerium

meitnerium

/ˈmaɪtnɪərɪəm/
noun
1.
a synthetic element produced in small quantities by high-energy ion bombardment. Symbol: Mt; atomic no: 109
Word Origin
C20: named after Lise Meitner
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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meitnerium in Science
meitnerium
  (mīt-nûr'ē-əm)   
Symbol Mt
A synthetic, radioactive element that is produced by bombarding bismuth with iron ions. Its most long-lived isotopes have mass numbers of 266 and 268 with half-lives of 3.4 milliseconds and 70 milliseconds, respectively. Atomic number 109. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for meitnerium

Mt

an artificially produced element belonging to the transuranium group, atomic number 109. It is predicted to have chemical properties resembling those of iridium.

Learn more about Mt with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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