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unniloctium

[yoo-ni-lok-tee-uh m]
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noun Chemistry, Physics.
  1. former name of hassium. Symbol: Uno
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Also called element 108.

hassium

[has-ee-uh m]
noun Chemistry, Physics.
  1. a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Hs; atomic number: 108.
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Origin of hassium

after Medieval Latin Hassia (the German state of Hesse, location of the institute where it was first created); see -ium
Formerly unniloctium, element 108.

element 108

noun Chemistry, Physics.
  1. hassium.
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Formerly unniloctium.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for unniloctium

hassium

noun
  1. a synthetic element produced in small quantities by high-energy ion bombardment. Symbol: Hs; atomic no: 108
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Word Origin

C20: from Latin, from Hesse, German state where it was discovered
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

unniloctium in Science

hassium

[häsē-əm]
Hs
  1. A synthetic, radioactive element that is produced by bombarding lead with iron ions. Its known isotopes have mass numbers ranging from 263 to 277. Hs 277 has the longest confirmed half-life (16.5 minutes). Atomic number 108. See Periodic Table.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.