- 1(also chestnut tree) [countable] a large tree with spreading branches, that produces smooth brown nuts inside cases that are covered with spikes. There are several types of chestnut trees. see also horse chestnut
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2[countable] a smooth brown nut of a chestnut tree, some types of which can be eaten roasted chestnuts The dessert was a rich mixture of chestnut purée and cream. see also water chestnut
- 3[uncountable] a deep reddish-brown color
- 4[countable] a horse of a reddish-brown color
- 5old chestnut [countable] (informal) an old joke or story that has been told so many times that it is no longer amusing or interesting
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