du·cal \ˈd(y)ükəl\adjective Etymology: Middle French, from Late Latin ducalis of a leader, from Latin duc-, dux leader + -alis -al — more at duke 1.: of, belonging to, or befitting a duke or dukedom < a ducal palace > 2.: having the rank of a duke < a mere ducal husband — Time > • du·cal·ly\-əlē, -li\adverb