1) Any cycad of the genus dioon 2) Cycad 
Dioon is a genus of cycads in the family Zamiaceae. It is native to Mexico and Central America. Their habitats include tropical forests, pine-oak forest, and dry hillsides, canyons and coastal dunes. Dioons are dioecious, palmlike shrubs with cylindrical stems, usually with many leaves. Leaf bases are persistent or shedding to leave smooth bark. T...
a New World genus of ornamental cycads (plants of the family Cycadaceae). It is the most primitive American genus in the family and includes four or ... [1 related articles]
[n] - any cycad of the genus Dioon
noun any cycad of the genus Dioon; handsome palmlike cycads with robust crowns of leaves and rugged trunks
any of several Mexican and Central American palmlike plants belonging to the genus Dioon, of the cycad family, having a crown of stiff, pinnate leaves.