from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An artificially produced radioactive element with atomic number 104 whose most long-lived isotopes have mass numbers of 253, 255, 257, and 259 with half-lives of 1.8, 1.6, 4.7, and 3.4 seconds, respectively. See Table at element.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A transuranic chemical element (symbol Rf) with an atomic number of 104
- n. A rejected name for seaborgium
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a radioactive transuranic element which has been synthesized
After Ernest Rutherford.(American Heritage® Dictionary of the English Language, Fourth Edition)
Named for Ernest Rutherford (Wiktionary)