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Webster 1913 Edition

Noun.

(Bot.)

A broad-leaved plant (

Petasites vulgaris

) of the Composite family, said to have been used in England for wrapping up pats of butter.

A butterbur (Petasites hybridus)

butterbur ‎(plural butterburs)

Any of several Eurasian herbs, of the genus Petasites, have dense clusters of often purple flowers

herb