- a small Eurasian water fern, Pilularia globulifera, with globular spore-producing bodies and grasslike leaves
C19: from pill 1 + wort
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
Examples from the Web for pillwort
The Pillwort is a singular plant not uncommon in damp situations.
The Pillwort so often grows mixed up with grass, which in some ways it resembles, that the plant is frequently overlooked.