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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.

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

t quark in Science

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.