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[law-ren-see-uh m] /lɔˈrɛn si əm/
noun, Chemistry.
a synthetic, radioactive, metallic element. Symbol: Lr; atomic number: 103.
Origin of lawrencium
1960-65; Lawrence Radiation Laboratory, Berkeley, California + -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for lawrencium


/lɒˈrɛnsɪəm; lɔː-/
a transuranic element artificially produced from californium. Symbol: Lr; atomic no: 103; half-life of most stable isotope, 256Lr: 35 seconds; valency: 3
Word Origin
C20: named after Ernest Orlando Lawrence (1901–58), US physicist
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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Word Origin and History for lawrencium



1961, Modern Latin, from the name of Ernest O. Lawrence (1901-1958), U.S. physicist, cyclotron pioneer and founder of the lab where it was discovered.

Online Etymology Dictionary, © 2010 Douglas Harper
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lawrencium in Medicine

lawrencium law·ren·ci·um (lô-rěn'sē-əm, lō-)
Symbol Lr
A radioactive synthetic element produced from californium and having isotopes with mass numbers 253 through 260 and half-lives of 650 milliseconds to 3 minutes; atomic number 103.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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lawrencium in Science
Symbol Lr
A synthetic, radioactive metallic element of the actinide series that is produced by bombarding californium with boron ions. Its most stable isotope is Lr 262 with a half-life of 3.6 hours. Atomic number 103. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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