from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Any of various particles of matter smaller than a hydrogen atom, including the elementary particles and hadrons.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun any of many
unitsof mattersmaller than an atom
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a body having finite mass and internal structure but negligible dimensions
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