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pillwort

British  
/ ˈpɪlˌwɜːt /

noun

  1. a small Eurasian water fern, Pilularia globulifera, with globular spore-producing bodies and grasslike leaves

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of pillwort

C19: from pill 1 + wort

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