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bot'tom quark"



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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

bottom-of-the-linebottom round
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