Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A quark with a charge of - 1/3 and a mass about 10,000 times that of the electron. Also called beauty quark. See Table at subatomic particle.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A quark having a fractional electric charge of -1/3 and a mass about 4,100 to 4,400 MeV. Symbol: b

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a quark with a charge of -1/3 and a mass about 10,000 times that of an electron

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