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

plural of butterbur

A flowering plant (Petasites japonicus), native to Asia.

A flowering plant native to North America, Petasites frigidus; sweet coltsfoot.

plural of giant butterbur

(US) A hamburger made with butter, whether it is mixed with the meat or applied to the bun before toasting.

plural of butterburger