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unnilpentium

[yoo-nil-pen-tee-uh m] /ˌyu nɪlˈpɛn ti əm/
noun, Chemistry, Physics.
1.
a former name of dubnium. Symbol: Unp.
Also called element 105.
Formerly hahnium.
Origin of unnilpentium
1975-1980
1975-80; < Latin ūn(us) one + nīl nothing + Greek pént(e) five + New Latin -ium -ium

dubnium

[doob-nee-uh m, duhb-] /ˈdub ni əm, ˈdʌb-/
noun, Chemistry, Physics.
1.
a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Db; atomic number: 105.
Formerly hahnium, unnilpentium, element 105.
Origin
named after Dubna, the town in Russia where it was first produced; see -ium

element 105

noun, Chemistry, Physics.
1.
Formerly unnilpentium, hahnium.
Origin
1975-80

hahnium

[hah-nee-uh m] /ˈhɑ ni əm/
noun, Chemistry, Physics.
1.
a proposed name for dubnium. Symbol: Ha.
Also called unnilpentium, element 105.
Origin
1965-70; after German chemist O. Hahn; see -ium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for unnilpentium

dubnium

/ˈdʌbnɪəm/
noun
1.
a synthetic transactinide element produced in minute quantities by bombarding plutonium with high-energy neon ions. Symbol: Du; atomic no 105 See hahnium
Word Origin
C20: after Dubna, where it was first reported

hahnium

/ˈhɑːnɪəm/
noun
1.
a name once advanced by the American Chemical Society for a transuranic element, artificially produced from californium, atomic no: 105; half-life of most stable isotope, 262Ha: 40 seconds Now called dubnium
Word Origin
C20: named after Otto Hahn
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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unnilpentium in Medicine

hahnium hah·ni·um (hä'nē-əm)
n.
Element 105.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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unnilpentium in Science
dubnium
  (db'nē-əm)   
Symbol 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 © 2002. Published by Houghton Mifflin. All rights reserved.
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