1 (alsochestnut tree)[countable]a large tree with spreading branches, that produces smooth brown nuts inside cases which are covered with spikes. There are several types of chestnut tree. see also horse chestnut2[countable]a smooth brown nut of a chestnut tree, some types of which can be eatenroast chestnutsThe dessert was a rich mixture of chestnut purée and cream. compare conker3[uncountable]a deep reddish-brown colour4[countable]a horse of a reddish-brown colour5old chestnut[countable] (informal) an old joke or story that has been told so many times that it is no longer amusing or interesting
ˈtʃesnʌt
ˈtʃesnʌt