Source : Webster's Revised Unabridged Dictionary (1913)

Fleabane \Flea"bane`\, n. (Bot.)
   One of various plants, supposed to have efficacy in driving
   away fleas. They belong, for the most part, to the genera
   {Conyza}, {Erigeron}, and {Pulicaria}.

Source : WordNet®

fleabane
     n 1: hairy perennial Eurasian herb with yellow daisylike flowers
          reputed to destroy or drive away fleas [syn: {feabane
          mullet}, {Pulicaria dysenterica}]
     2: any of several North American plants of the genus Erigeron
        having daisylike flowers; formerly believed to repel fleas
     3: common North American weed with linear leaves and small
        discoid heads of yellowish flowers; widely naturalized
        throughout temperate regions; sometimes placed in genus
        Erigeron [syn: {horseweed}, {Canadian fleabane}, {Conyza
        canadensis}, {Erigeron canadensis}]