[ doob-nee-uhm, duhb- ]
/ ˈdub ni əm, ˈdʌb- /
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noun Chemistry, Physics.
a superheavy, synthetic, radioactive element with a very short half-life.Symbol: Db; atomic number: 105.
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Formerly un·nil·pen·ti·um [yoo-nil-pen-tee-uhm], /ˌyu nɪlˈpɛn ti əm/, el·e·ment 105 .
Origin of dubnium
First recorded in 1990–95; named after Dubna, the town in Russia where it was first produced.
Words nearby dubnium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
British Dictionary definitions for dubnium
/ (ˈdʌbnɪəm) /
a synthetic transactinide element produced in minute quantities by bombarding plutonium with high-energy neon ions. Symbol: Du; atomic no 105See hahnium
Word Origin for dubnium
C20: after Dubna, where it was first reported
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
Medical definitions for dubnium
[ dōōb′nē-əm ]
n. Symbol Db
A radioactive synthetic element whose longest-lived isotopes have mass numbers of 258, 261, 262, and 263 with half-lives of 4.2, 1.8, 34, and 30 seconds. Atomic number 105.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Scientific definitions for dubnium
[ dōōb′nē-əm ]
A synthetic, radioactive element that is produced from californium, americium, or berkelium. Its most long-lived isotopes have mass numbers of 258, 261, 262, and 263 with half-lives of 4.2, 1.8. 34, and 30 seconds, respectively. Atomic number 105. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.