definitions

down quark

noun Physics.

the quark having electric charge −1/3 times the elementary charge, with strangeness, charm, and other quark quantum numbers equal to 0.

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Nearby words

down on one's luck, down one's alley, down one's neck, down one's nose, down payment, down quark, down someone's throat, down syndrome, down the drain, down the hatch, down the line

Origin of down quark

First recorded in 1975–80
Also called d quark.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Science definitions for d quark

down quark

[ doun ]

A quark with a charge of -1/3. Its mass is greater than that of the electron and the up quark, but smaller than that of all the other quarks. See Table at subatomic particle.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.