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2 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.
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From: WordNet (r) 2.0

 Trapa bicornis
      n : water chestnut whose spiny fruit has two rather than 4
          prongs [syn: ling, ling ko]