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dubnium

[ doob-nee-uhm, duhb- ]
/ 藞dub ni 蓹m, 藞d蕦b- /
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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路nil路pen路ti路um [yoo-nil-pen-tee-uhm], /藢yu n瑟l藞p蓻n ti 蓹m/, el路e路ment 105 .

Origin of dubnium

First recorded in 1990鈥95; named after Dubna, the town in Russia where it was first produced.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, 漏 Random House, Inc. 2022

British Dictionary definitions for dubnium

dubnium
/ (藞d蕦bn瑟蓹m) /

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 漏 William Collins Sons & Co. Ltd. 1979, 1986 漏 HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for dubnium

dubnium
[ d艒艒bn膿-蓹m ]

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庐 Stedman's Medical Dictionary Copyright 漏 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for dubnium

dubnium
[ d艒艒bn膿-蓹m ]

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庐 Science Dictionary Copyright 漏 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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