Found 2 items, similar to water caltrop.
English → English (WordNet) Definition: water caltrop water caltrop n : a variety of water chestnut [syn: Jesuits' nut, Trapa natans ]
English → English (gcide) Definition: water caltrop Water chestnut \Wa“ter chest”nut\ (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]