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bottom quark

noun, Physics.
the quark having electric charge −1/3 times the elementary charge and bottom quantum number −1. It is more massive than the up, down, strange, and charmed quarks.
Also called beauty quark, b quark, b-quark.
1975-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for bottom quark
  • Thus, it is not surprising that enormous effort has gone into searches in the bottom quark mode.
bottom quark in Science
bottom quark
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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