from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A naturally or artificially produced radioactive isotope of an element.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a radioactive isotope of an element
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a radioactive isotope of an element; produced either naturally or artificially
Sorry, no etymologies found.