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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Myriophyllum
n : chiefly monoecious and usually aquatic herbs (as the
milfoils) [syn: genus Myriophyllum]