any plant belonging to the genus Parnassia, of the saxifrage family, growing in marshy areas, having broad, smooth leaves and a single, pale flower.
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British Dictionary definitions for grass-of-Parnassus
a herbaceous perennial N temperate marsh plant, Parnassia palustris, with solitary whitish flowers: family Parnassiaceae
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