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meitnerium

[ mahyt-nur-ee-uhm ]
/ maɪtˈnɜr i əm /
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noun Chemistry, Physics.
a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Mt; atomic number: 109.
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Formerly unnilennium .

Origin of meitnerium

First recorded in 1975–80; officially assigned to element 109 in 1997; named after Austrian physicist Lise Meitner; see -ium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

British Dictionary definitions for meitnerium

meitnerium
/ (ˈmaɪtnɪərɪəm) /

noun
a synthetic element produced in small quantities by high-energy ion bombardment. Symbol: Mt; atomic no: 109

Word Origin for meitnerium

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

Scientific definitions for meitnerium

meitnerium
[ mīt-nûrē-əm ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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