from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The radioactive decay of an atomic nucleus by emission of an alpha particle.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
Radioactive decayby emitting an alpha particle.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun radioactive decay of an atomic nucleus that is accompanied by the emission of an alpha particle
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