from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of the subatomic particles that compose matter and energy, especially one hypothesized or regarded as an irreducible constituent of matter. Also called fundamental particle. See Table at subatomic particle.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. fundamental particle; any of the subatomic particles that does not consist of other, smaller particles; the gauge bosons, leptons and quarks
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (physics) a particle that is less complex than an atom; regarded as constituents of all matter
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