Is “Xis” a Scrabble word?
Yes
XIS
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 Xis
noun
1.The 14th letter of Classical and Modern Greek. The 15th in Ancient and Old Greek.
2.Either of a pair of hyperons having spin 1/2, which decay into a lambda particle and a pion.