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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Wa·ter mil·foil Bot. Any plant of the genus Myriophyllum, aquatic herbs with whorled leaves, the submersed ones pinnately parted into capillary divisions.
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water milfoil
n : an aquatic plant of the genus Myriophyllum having feathery
underwater leaves and small inconspicuous flowers