from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The flavor of quark that has a charge of − 1/3 and a mass about 10 times that of an electron, belongs to the first generation of elementary fermions, and is a component of nucleons and other hadrons.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A quark having a
fractional electric chargeof -1/3 and a massabout 4 to 8 MeV. Symbol: d
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a stable quark with an electric charge of -1/3 and a mass 607 times that of an electron
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