chestnut, name for any species of the genus Castanea, deciduous trees of the family Fagaceae (beech beech, common name for the Fagaceae, a family of trees and shrubs mainly of temperate and subtropical regions in the Northern Hemisphere.
Chestnut wood is porous, but it is very durable in soil and has been popular for fence posts, railway ties, and beams.
Chestnuts are classified in the division Magnoliophyta Magnoliophyta (măg'nōlēŏf`ətə), division of the plant kingdom consisting of those organisms commonly called the flowering plants, or angiosperms.