Definition of "Fleabane" :

noun: common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron

noun: any of several North American plants of the genus Erigeron having daisylike flowers; formerly believed to repel fleas

noun: hairy perennial Eurasian herb with yellow daisylike flowers reputed to destroy or drive away fleas