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.

  • noun Radioactive decay by 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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