- (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 tree. 栗树 - [countable]
a smooth brown nut of a chestnut tree, some types of which can be eaten 栗子；板栗 
roast chestnuts 炒板栗 The dessert was a rich mixture of chestnut purée and cream. 甜点是栗子泥和奶油的丰富混合物。
- [uncountable]
a deep red-brown colour 栗色马；红棕马 Oxford Collocations Dictionaryadjective- bright
- glossy
- rich
- …
- [countable]
a horse of a red-brown colour 栗色；深红棕色 - old chestnut [countable] (informal)
an old joke or story that has been told so many times that it is no longer funny or interesting 陈腐的笑话；老掉牙的故事
Word Originearly 16th cent.: from Old English chesten (from Old French chastaine, via Latin from Greek kastanea) + nut.