Etymology
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fleabane (n.)

also flea-bane, 1540s, from flea (n.) + bane (n.). Old English had fleawyrt, used of various plants supposed to destroy fleas.

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Definitions of fleabane

fleabane (n.)
hairy perennial Eurasian herb with yellow daisylike flowers reputed to destroy or drive away fleas;
Synonyms: feabane mullet / Pulicaria dysenterica
fleabane (n.)
any of several North American plants of the genus Erigeron having daisylike flowers; formerly believed to repel fleas;
fleabane (n.)
common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron;
Synonyms: horseweed / Canadian fleabane / Conyza canadensis / Erigeron canadensis
From wordnet.princeton.edu