Noun | 1. | butterbur - small Eurasian herb having broad leaves and lilac-pink rayless flowers; found in moist areas genus Petasites, Petasites - genus of rhizomatous herbs of north temperate regions: butterbur; sweet coltsfoot herb, herbaceous plant - a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests |