(Bot.) 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. [ 1913 Webster ]
[ひし, hishi] (n) (1) (uk) Trapa japonica (species of plant closely related to water chestnut or water caltrop); (2) caltrop (weapon); caltrap #14,890[Add to Longdo]
[くろぐわい;クログワイ, kuroguwai ; kuroguwai] (n) (1) (uk) Eleocharis kuroguwai (species of spikerush); (2) (uk) (See 大黒慈姑) Chinese water chestnut (Eleocharis dulcis var. tuberosa) [Add to Longdo]
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