fleabane \ˈ ̷ ̷ˌ ̷ ̷\noun : any of various plants of the family Compositae that are supposed to drive away fleas: as a.alsofleabane mullet: a hairy perennial herb (Pulicaria dysenterica) with yellow ray flowers that is native to Europe but widely naturalized b.: any of several plants of the genera Erigeron and Artemisia — see daisy fleabane