Word:

up quark

Noun1.up quark - a stable quark with an electric charge of +2/3 and a mass 607 times that of an electron
quark
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Unwroken
unyielding
unyieldingness
Unyoke
Unyoked
Unyolden
unzip
Unzoned
Up
Up anchor
up and down
Up grade
Up helm
up here
up in the air
up on
-- up quark --
Up stairs
up the stairs
up to
up to her neck
up to his neck
up to my neck
up to now
up to our necks
Up to snuff
Up to the ears
Up to the hub
up to their necks
up to your neck
up-and-coming
up-bow
up-country
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