Up-quark

up quark

noun Physics.
the quark having electric charge 2/3 times the elementary charge and strangeness and charm equal to 0.
Also called u quark.


Origin:
1975–80

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American Heritage
Science Dictionary
up quark   (ŭp)  Pronunciation Key 
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.
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