Dictionary

water chestnut

noun

: the white root of a plant that grows in water and that is often used in Chinese cooking

Full Definition of WATER CHESTNUT

1
:  any of a genus (Trapa, especially T. natans of the family Trapaceae, the water-chestnut family) of Old World aquatic herbs sometimes grown as ornamentals; also :  its edible nutlike spiny fruit
2
:  a whitish crunchy vegetable used especially in Chinese cooking that is the peeled and often sliced tuber of a sedge (Eleocharis dulcis syn. E. tuberosa) native to Asia but widely cultivated elsewhere; also :  the tuber or the sedge itself

First Known Use of WATER CHESTNUT

1847

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