meitnerium

[ mahyt-nur-ee-uhm ]
/ maɪtˈnɜr i əm /

noun Chemistry, Physics.

a superheavy, synthetic, radioactive element. Symbol: Mt; atomic number: 109.

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Formerly un·ni·len·ni·um [yoo-ni-len-ee-uhm] /ˌyu nɪˈlɛn i əm/ , el·e·ment 109 .

Origin of meitnerium

First recorded in 1990–95; named after Austrian physicist Lise Meitner. Its former name, unnilennium, is from Latin ūn(us) “one” + nīl “nothing” + Greek enn(ė́a) “nine” + New Latin -ium; see origin at one, nil, nine, -ium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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

Medical definitions for meitnerium

meitnerium
[ mīt-nûrē-əm ]

n. Symbol Mt

A radioactive synthetic element whose longest-lived isotopes have mass numbers of 266 and 268 with half-lives of 3.4 milliseconds and 70 milliseconds. Atomic number 109.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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.