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[bawr-ee-uh m, bohr-] /ˈbɔr i əm, ˈboʊr-/
noun, Chemistry, Physics.
a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Bh; atomic number: 107.
Formerly unnilseptium, element 107.
Origin of bohrium
named after Danish physicist Niels Bohr; see -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for bohrium


a transuranic element artificially produced in minute quantities by bombarding 204Bi atoms with 54Cr nuclei. Symbol: Bh; atomic no: 107 Former names element 107, unnilseptium
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
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bohrium in Science
Symbol Bh
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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