trapa natans

from WordNet (r) 3.0 (2006)

Trapa natans
    n 1: a variety of water chestnut [syn: {water caltrop},
         {Jesuits' nut}, {Trapa natans}]

from The Collaborative International Dictionary of English v.0.48

Saligot \Sal"i*got\, n. [F.] (Bot.)
   The water chestnut ({Trapa natans}).
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

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]

[email protected]