dubnium
[ 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
Dublin, Dublin Bay prawn, Dubliner, Dubliners, Dubna, dubnium, Du Bois, Dubois abscesses, DuBois, W. E. B., Dubonnet, Dubos
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
British Dictionary definitions for dubnium
dubnium
/ (ˈdʌbnɪəm) /
noun
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
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Medical definitions for dubnium
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
dubnium
[ dōōb′nē-əm ]
Db
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.