from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The flavor of quark that has a charge of − 1/3 , has a mass about 8,220 times that of an electron, and belongs to the third generation of elementary fermions.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun 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.

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


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