The Eurasian bullfinch (Pyrrhula pyrrhula).
Any of various other Old World finches in the genus Pyrrhula.
The horse-chestnut.
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.
A tree or shrub of the genus Castanea.
The wood of a chestnut tree.
A dark, reddish-brown colour, as seen on the fruit of the chestnut tree.
A reddish-brown horse.
A nut of this tree or shrub.
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").
Of a deep reddish-brown colour, like that of a chestnut.