definitions

top quark

noun Physics.

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

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Nearby words

top kill, top loader, top management, top off, top out, top quark, top round, top sergeant, top slicing, top ten, top timber

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

Science 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.