from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A short-lived, radioactive synthetic transuranic element produced from californium and whose most stable isotope has a mass number of 262 with a half-life of 3.6 hours; atomic number 103. See Table at element.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A transuranic chemical element (symbol Lr, formerly Lw) with atomic number 103.

from the GNU version of the Collaborative International Dictionary of English

  • n. A transuranic element of atomic number 103. It was discovered in 1961 by bombardment of californium in a cyclotron with boron nuclei. Other isotopes were prepared in 1965 at Dubna. The atomic weight of the most stable isotope is 256, having a half-life of 35 seconds. Symbol Lr.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a radioactive transuranic element synthesized from californium


After Ernest Orlando Lawrence.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Named for Ernest Lawrence. (Wiktionary)


  • Lawrence Berkeley Laboratory at Berkeley, California; Lawrence Livermore National Laboratory at Livermore, California; and element 103, lawrencium, were all named in his honor.

    Lawrence, Ernest Orlando

  • The Lawrence Berkeley Laboratory has produced a dozen superheavy elements called transuranics and bear such names as berkelium, californium, lawrencium and seaborgium.

    SFGate: Top News Stories

  • The list comes to some 103, ranging from the most abundant and simplest of all, hydrogen, to the transuranic monsters, nobelium and lawrencium.

    VERBATIM: The Language Quarterly Vol 1 No 3


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