up quark


noun Physics.

the quark having electric charge 2/3 times the elementary charge and strangeness and charm equal to 0.

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Did you ever collect all those state quarters? Put them to good use on this quiz about curious state monikers and the facts around them.
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Mississippi’s nickname comes from the magnificent trees that grow there. What is it?
Also called u quark.

Origin of up quark

First recorded in 1975–80

Words nearby up quark

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Scientific definitions for up quark

up quark
[ ŭp ]

A quark with a charge of +2/3. Its mass is approximately 10 times the electron mass and is the least mass of all quarks. See Table at subatomic particle.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.