dioon - any cycad of the genus Dioon; handsome palmlike cycads with robust crowns of leaves and rugged trunkscycad - any tropical gymnosperm of the order Cycadales; having unbranched stems with a crown of fernlike leavesgenus Dioon - small genus of arborescent cycads of Mexico and Central America; sometimes classified in family Cycadaceae
dioon - any cycad of the genus Dioon; handsome palmlike cycads with robust crowns of leaves and rugged trunks