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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Wa·ter let·tuce Bot. A plant (Pistia stratiotes) which floats on tropical waters, and forms a rosette of spongy, wedge-shaped leaves.
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From: WordNet (r) 2.0

 water lettuce
      n : pantropical floating plant forming a rosette of wedge-shaped
          leaves; a widespread weed in rivers and lakes [syn: pistia,
           water cabbage, Pistia stratiotes, Pistia stratoites]