Etymology
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milfoil (n.)

"yarrow," a composite herb, mid-13c., from Old French milfoil, from Latin millefolium, literally "thousand leaf," so called from the abundance of its leaves; from mille "thousand" (see million) + folium "leaf" (from PIE root *bhel- (3) "to thrive, bloom").

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Definitions of milfoil

milfoil (n.)
ubiquitous strong-scented mat-forming Eurasian herb of wasteland, hedgerow or pasture having narrow serrate leaves and small usually white florets; widely naturalized in North America;
Synonyms: yarrow / Achillea millefolium
From wordnet.princeton.edu