| Noun | 1. | parnassia - any of various usually evergreen bog plants of the genus Parnassia having broad smooth basal leaves and a single pale flower resembling a buttercupgenus Parnassia - genus of bog herbs of arctic and northern temperate regions bog plant, marsh plant, swamp plant - a semi-aquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath | |