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unnilseptium

[yoo-nil-sep-tee-uh m]
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noun Chemistry, Physics.
  1. former name of bohrium.Symbol: Uns
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Origin of unnilseptium

< Latin ūn(us) one + nīl nothing + sept(em) seven + New Latin -ium -ium
Also called element 107.

bohrium

[bawr-ee-uh m, bohr-]
noun Chemistry, Physics.
  1. a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Bh; atomic number: 107.
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Origin of bohrium

named after Danish physicist Niels Bohr; see -ium
Formerly unnilseptium, element 107.

element 107

noun Chemistry, Physics.
  1. bohrium.
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Origin of element 107

First recorded in 1975–80
Formerly unnilseptium.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for unnilseptium

bohrium

noun
  1. a transuranic element artificially produced in minute quantities by bombarding 204 Bi atoms with 54 Cr nuclei. Symbol: Bh; atomic no: 107Former names: element 107, unnilseptium
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Word Origin

C20: after Neils Bohr
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
unnilseptium in Science

bohrium

[bôr′ē-əm]
Bh
  1. A synthetic, radioactive element that is produced by bombarding bismuth with chromium ions. Its most long-lived isotopes have mass numbers of 261, 262, and 264 with half-lives of 11.8 milliseconds, 0.1 second, and 0.44 second, respectively. Atomic number 107. See Periodic Table.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.