from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The radioactive decay of an atomic nucleus accompanied by emission of a beta particle.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A nuclear reaction in which a beta particle (electron or positron) is emitted
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. radioactive decay of an atomic nucleus that is accompanied by the emission of a beta particle
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