Is “Si” a Scrabble word?
Yes
SI
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 Si
/si/
noun
1.A syllable used in solfège to represent the seventh note of a major scale.