meitnerium

meitnerium

[mahyt-nur-ee-uhm]
noun Chemistry, Physics.
a superheavy, synthetic, radioactive element. Symbol: Mt; atomic number: 109.
Formerly unnilennium, element 109.


Origin:
named after Austrian physicist Lise Meitner; see -ium

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Collins
World English Dictionary
meitnerium (ˈmaɪtnɪərɪəm)
 
n
a synthetic element produced in small quantities by high-energy ion bombardment. Symbol: Mt; atomic no: 109
 
[C20: named after Lise Meitner]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
meitnerium   (mīt-nûr'ē-əm)  Pronunciation Key 
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 Britannica
Encyclopedia

meitnerium

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

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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