roentgenium

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roent·gen·i·um

 (rĕnt-gĕn′ē-əm, -jĕn′- rŭnt-, rœnt-gen′-)
n. Symbol Rg
An artificially produced radioactive element with atomic number 111 that has only been produced in trace amounts. Its most stable known isotope has a mass number of 280 and a half-life of 3.6 seconds. See Periodic Table.

[After Wilhelm Conrad Roentgen.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

roentgenium

(rɒntˈɡɛnɪəm; rɛnt-)
n
(Elements & Compounds) a synthetic radioactive element produced in small quantities by cold fusion in a linear accelerator. Symbol: Rg; atomic no: 111
[C21: named after W. K. Roentgen]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.roentgenium - a radioactive transuranic element
chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
RoentgeniumRöntgenium
röntgeenium
röntgenium
roentgenium
rendgenij
roentgenio
roentgenium
roentgenium
roentgen
roentgênio
röntgenium
röntgenyum