bog rhubarb | sense examples, Usage and Definition from wordnet dictionary online

Noun bog rhubarb has 1 sense

butterbur, bog rhubarb, Petasites hybridus, Petasites vulgaris - small Eurasian herb having broad leaves and lilac-pink rayless flowers; found in moist areas
--₁ is a kind of herb, herbaceous plant
--₁ is a member of Petasites, genus Petasites