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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Pill·wort n. Bot. Any plant of the genus Pilularia; minute aquatic cryptograms, with small pill-shaped fruit; -- sometimes called peppergrass.
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From: WordNet (r) 2.0

 pillwort
      n : European water fern found around margins of bodies of water
          or in wet acid soil having small globose sporocarps [syn:
           Pilularia globulifera]