top quark

noun Physics.

a heavy quark having electric charge 2/3 times the elementary charge.

Origin of top quark

First recorded in 1975–80
Also called t quark, truth quark. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Scientific definitions for t quark

top quark
[ tŏp ]

A quark with a charge of +2/3. Its mass is larger than that of all the other quarks and is about 360,000 times that of the electron. See Table at subatomic particle.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.