Is “Psis” a Scrabble word?
Yes
PSIS
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 Psis
noun
1.The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek.
2.A form of psychic energy.