Is “Quadrilateral” a Scrabble word?
Yes
QUADRILATERAL
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 Quadrilateral
/ˌkwɒd.ɹəˈlæt.əɹ.əl/
noun
1.A polygon with four sides.
2.An area defended by four fortresses supporting each other.
“The Venetian quadrilateral comprised Mantua, Peschiera, Verona, and Legnano.”
adjective
1.Having four sides.