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)