down quark
noun Physics.
the quark having electric charge −1/3 times the elementary charge, with strangeness, charm, and other quark quantum numbers equal to 0.
Also called
d quark.
Origin of down quark
First recorded in 1975–80
Words nearby down quark
Scientific definitions for d quark
down quark
[ doun ]
A quark with a charge of -1/3. Its mass is greater than that of the electron and the up quark, but smaller than that of all the other quarks. See Table at subatomic particle.