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|Noun||1.||genus Dioon - small genus of arborescent cycads of Mexico and Central America; sometimes classified in family Cycadaceae|
gymnosperm genus - a genus of gymnosperms
family Zamiaceae, zamia family, Zamiaceae - a family of cycads often included in the family Cycadaceae: zamias
dioon - any cycad of the genus Dioon; handsome palmlike cycads with robust crowns of leaves and rugged trunks