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unnilennium

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un⋅ni⋅len⋅ni⋅um

  [yoo-nuh-len-ee-uhm]
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–noun Chemistry.
former name of meitnerium.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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meit·ner·i·um   (mīt-nûr'ē-əm)   
n.   Symbol Mt
An artificially produced radioactive element with atomic number 109 that has known isotopes with mass numbers ranging from 265 to 279. The isotope with the longest confirmed half-life (0.7 seconds) is Mt 268. Also called unnilennium. See Table at element.

[After Lise Meitner.]
un·nil·en·ni·um   (yōō'nə-lěn'ē-əm)   
n.  See meitnerium.

[Latin ūnus, one; see union + Latin nīl, nothing; see nil + Greek ennea, nine; see ennead + -ium.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia

unnilennium

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 unnilennium with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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