Try Our Apps


Is irregardless a word?


[ber-kee-lee-uh m] /bərˈki li əm/
noun, Chemistry.
a transuranic element. Symbol: Bk; atomic number: 97; atomic weight: 249 (?).
Origin of berkelium
1945-50; named after Berkeley, California, where it was discovered; see -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
Cite This Source
British Dictionary definitions for berkelium


/bɜːˈkiːlɪəm; ˈbɜːklɪəm/
a metallic transuranic element produced by bombardment of americium. Symbol: Bk; atomic no: 97; half-life of most stable isotope, 247Bk: 1400 years; valency: 3 or 4; relative density: 14 (est)
Word Origin
C20: named after Berkeley1, where it was discovered
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
Cite This Source
berkelium in Medicine

berkelium ber·ke·li·um (bər-kē'lē-əm, bûrk'lē-əm)
Symbol Bk
A synthetic radioactive element. Its most stable isotope, Bk 247, has a half-life of 1,380 years. Atomic number 97; melting point 1,050°C; valence 3, 4.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
berkelium in Science
  (bər-kē'lē-əm, bûrk'lē-əm)   
Symbol Bk
A synthetic, radioactive metallic element of the actinide series that is produced from americium, curium, or plutonium. Its most stable isotope has a half-life of about 1,400 years. Atomic number 97; melting point 986°C; valence 3, 4. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for berkelium

Few English speakers likely know this word

Word Value for berkelium

Scrabble Words With Friends

Nearby words for berkelium