noun
Refers specifically to the plant Eleocharis dulcis var. tuberosa, known for its edible corms. In Japanese, it is a botanical term, not an everyday food word.
オオクログワイは湿地で栽培される。
Chinese water chestnuts are cultivated in wetlands.
The Japanese name オオクログワイ literally means 'large black arrowhead', likely referring to the plant's appearance. The exact derivation is uncertain.