■ noun
1》 a glossy hard brown nut which develops within a bristly case and can be roasted and eaten.
2》 (also ~ tree , sweet ~ , or Spanish ~ ) the large tree that produces ~s. [ Castanea sativa .]
↘used in names of similar nuts, and trees and plants that produce them, e.g. horse ~ , water ~ .
3》 a deep reddish-brown colour.
4》 a horse of a reddish-brown or yellowish-brown colour.
5》 a small horny patch on the inside of a horse's leg.
Phrases
an old ~ a joke, story, or subject that has become uninteresting through constant repetition.
Origin
C16: from OE chesten (from OFr. chastaine , via L. from Gk kastanea ) + nut .