up quark

noun Physics.

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

Nearby words

  1. up in arms,
  2. up in the air,
  3. up on something, be,
  4. up one's alley,
  5. up one's sleeve,
  6. up the creek,
  7. up the river,
  8. up the wall,
  9. up to,
  10. up to a point

Origin of up quark

First recorded in 1975–80

Also called u quark.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Science 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.