Is “Arioso” a Scrabble word?
Yes
ARIOSO
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 Arioso
noun
1.A musical style, in opera and oratorio, that is more melodic than recitative, but less so than aria