Sal·i·got n.  Bot. The water chestnut (Trapa natans).
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  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.
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  Trapa natans
       n : a variety of water chestnut [syn: water caltrop, Jesuits'
           nut]