from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A reaction, as in fission, fusion, or radioactive decay, that alters the energy, composition, or structure of an atomic nucleus.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a process such as the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and / or subatomic particles in which the number of protons and / or neutrons in a nucleus changes; the reaction products may contain a different element or a different isotope of the same element
from the GNU version of the Collaborative International Dictionary of English
- n. A process that alters the energy or structure or composition of an atomic nucleus.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (physics) a process that alters the energy or structure or composition of atomic nuclei
Sorry, no etymologies found.
Eventually — or so the theory goes — one of these cycles will dump enough matter onto B to trigger a proton-proton nuclear reaction in the surface.