The fruit of Trapa natans and Trapa bicornis, Old World water plants bearing edible nutlike fruits armed with several hard and sharp points; also, the plant itself; -- called also water caltrop.
Aquatic, walnut size tuber with fibrous brown peel and crunchy, sweet, ivory colored flesh. Available fresh or canned.
The edible tuber of a water plant from Southeast Asia. Fresh water chestnuts, available in Asian groceries, have a brownish-black outer covering and crisp, white, crunchy flesh. They are also available canned at most supermarkets.