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Meaning of bottom quark

bot'tom quark"

Pronunciation: [key]
— Physics. Physics.
  1. 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
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.