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[uhn-uh-nil-ee-uh m] /ˌʌn əˈnɪl i əm/
noun, Chemistry, Physics.
former name of darmstadtium. Symbol: Uun.
Also called element 110.


[dahrm-stat-ee-uh m] /dɑrmˈstæt i əm/
noun, Chemistry, Physics.
a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Ds; atomic number: 110.
Formerly ununnilium, element 110.
Origin of darmstadtium
named after Darmstadt, the city in Germany where it was first created; see -ium

element 110

noun, Chemistry, Physics.
Formerly ununnilium. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Contemporary definitions for ununnilium

a synthetic chemical element, element 110 of the periodic chart (Ds) in the same group as nickel, palladium, and platinum

Word Origin

1984; formerly ununnilium or Eka-Platinum's 21st Century Lexicon
Copyright © 2003-2014, LLC
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ununnilium in Science
The temporary name given to chemical element 110. This element has now been officially named darmstadtium. The symbol for ununnilium was Uun.
Symbol Ds
A synthetic radioactive element, first produced by bombarding lead atoms with nickel atoms. The isotope first synthesized has a mass number of 269 and a half-life of 0.18 milliseconds. Atomic number 110. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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