Is “Sesquioxide” a Scrabble word?
Yes
SESQUIOXIDE
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 Sesquioxide
noun
1.Any oxide containing three oxygen atoms for every two atoms of another element.