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water chestnut
(redirected from water caltrops)

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water chestnut: see sedge sedge, common name for members of the Cyperaceae, a family of grasslike and rushlike herbs found in all parts of the world, especially in marshes of subarctic and temperate zones.
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water chestnut

Any of several perennial water plants of the genus Trapa (family Trapaceae), native to Europe, Asia, and Africa, or their edible, nutlike fruit. The water caltrop (T. natans) has two sets of leaves—long, feathery, rootlike, submerged leaves and a loose rosette of floating leaves attached to leafstalks 2–4 in (5–10 cm) long. The small fruit usually has four spiny angles. The Chinese water chestnut (Eleocharis tuberosus or E. dulcis) is a member of the sedge family.


water chestnut
1. a floating aquatic onagraceous plant, Trapa natans, of Asia, having four-pronged edible nutlike fruits
2. Chinese water chestnut. a Chinese cyperaceous plant, Eleocharis tuberosa, with an edible succulent corm


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