| bottom quark n. Abbr. b 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. |
bottom quark (b t  m) A quark with a charge of - 1/3 . Its mass is smaller than that of the top quark, but larger than that of all the other quarks. The bottom quark is sometimes referred to as the beauty quark, though this term is falling out of use. See Table at subatomic particle. |
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| Noun | 1. | bottom quark - a quark with a charge of -1/3 and a mass about 10,000 times that of an electron quark - (physics) hypothetical truly fundamental particle in mesons and baryons; there are supposed to be six flavors of quarks (and their antiquarks), which come in pairs; each has an electric charge of +2/3 or -1/3; "quarks have not been observed directly but theoretical predictions based on their existence have been confirmed experimentally" |
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