mil·foil /ˈmɪlˌfɔɪl/
  耆草屬植物,西洋耆草
  Mil·foil n.  Bot. A common composite herb (Achillea Millefolium) with white flowers and finely dissected leaves; yarrow.
  Water milfoil Bot., an aquatic herb with dissected leaves (Myriophyllum).
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  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 [syn: yarrow, Achillea
           millefolium]