What does water chestnut mean?
• WATER CHESTNUT (noun) The noun WATER CHESTNUT has 3 senses: 1. a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits 2. Chinese sedge yielding edible bulb-shaped tubers 3. edible bulbous tuber of a Chinese marsh plant Familiarity information: WATER CHESTNUT used as a noun is uncommon.