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Noun
A
quark
having
a
fractional
electric charge
of
<
math
>
-
\
frac
{
1
}{
3
}math
>
and
a
mass
of
about
4
to
8
MeV
.<
br
>
Symbol
: <
math
>
d
math
>
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Rejected by Y-Combinator. Definitions by Wiktionary.

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