Definitions from Wiktionary ( )

▸ noun:  A tree or shrub of the genus Castanea.
▸ noun:  A nut of this tree or shrub.
▸ noun:  (uncountable) A dark, reddish-brown colour, as seen on the fruit of the chestnut tree.
▸ noun:  A reddish-brown horse.
▸ noun:  (uncountable) Wood of a chestnut tree.
▸ noun:  (figurative) An old joke; a worn-out meme, phrase, ploy, etc. so often repeated as to have grown tiresome or ineffective (often in the phrase "old chestnut").
▸ noun:  A round or oval horny plate found on the inner side of the leg of a horse or other animal, similar to a birthmark on a human.
▸ noun:  (UK) The horse-chestnut.
▸ adjective:  Of a deep reddish-brown colour, like that of a chestnut.
▸ noun:  A surname.

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