qua·dran·gu·lar \(ˈ)kwä|draŋgyələ(r), -raiŋ- sometimes (ˈ)kwȯ|-\adjective Etymology: Late Latin quadrangularis, from quadrangulum quadrangle + Latin -aris -ar : having four angles and consequently four sides : tetragonal < the interior structure was composed of a quadrangular skeleton of stout poles lashed together — American Anthropologist > • qua·dran·gu·lar·lyadverb