quadrangularEnglishOxford New American Dictionaryquadrangular /kwäˈdraNGɡyələr, kwɑˈdræŋɡjələr / ▸ adjective (of an object or architectural structure) having four sides: a quadrangular sail. ▪ British (of a sporting contest) involving four teams competing against each other: a boys' quadrangular tournament.