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|Noun||1.||dioon - any cycad of the genus Dioon; handsome palmlike cycads with robust crowns of leaves and rugged trunks|
cycad - any tropical gymnosperm of the order Cycadales; having unbranched stems with a crown of fernlike leaves
genus Dioon - small genus of arborescent cycads of Mexico and Central America; sometimes classified in family Cycadaceae
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