trapa : Idioms & Phrases
genus trapa
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noun small genus of Eurasian aquatic perennial herbs: water chestnut
Trapa.
WordNet
trapa bicornis
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noun water chestnut whose spiny fruit has two rather than 4 prongs
ling; ling ko.
WordNet
trapa natans
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noun a variety of water chestnut
Jesuits' nut; water caltrop.