1 (also Chinese water chestnut) the tuber of a tropical sedge that is widely used in Asian cooking, its white flesh remaining crisp after cooking. 2the sedge that yields water chestnut, which is cultivated in flooded fields in Southeast Asia.
- Eleocharis tuberosa, family Cyperaceae
3 (also water caltrop) an aquatic plant with small white flowers, producing an edible rounded seed with two large projecting horns.
- Trapa natans, family Trapaceae