Definition from Wiktionary, the free dictionary
- A tree or shrub of the genus Castanea.
- The nut of this tree or shrub.
- (uncountable) A dark, reddish-brown colour/color.
- A reddish-brown horse.
- (uncountable) The wood of a chestnut tree.
- (idiomatic) (Often "old chestnut") A worn-out meme; a work so often repeated as to have grown tiresome.
- A part of a horse found on the inner leg, similar to a birthmark on a human.
- (tree): chestnut tree
chestnut tree — see chestnut tree
nut of the chestnut tree
wood of a chestnut tree
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Derived terms 
terms derived from chestnut (noun)
chestnut (not comparable)
of a deep reddish-brown colour