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3 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 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.
 

From: Webster's Revised Unabridged Dictionary (1913)

 Wa·ter cal·trop Bot. The water chestnut.
 

From: WordNet (r) 2.0

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