Is “Quark” a Scrabble word?
Yes
QUARK
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Quark
/kwɑːk/
noun
1.In the Standard Model, an elementary subatomic particle that forms matter. They combine to form hadrons, such as protons and neutrons.
2.(X Window System) An integer that uniquely identifies a text string.