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Any of various cosmopolitan aquatic herbs of the genus Myriophyllum, having whorls of feathery submersed leaves, especially M. spicatum of Eurasia, which can form dense mats in North American rivers and lakes.
(Plants) any of various pond plants of the genus Myriophyllum, having feathery underwater leaves and small inconspicuous flowers: family Haloragidaceae
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|Noun||1.||water milfoil - an aquatic plant of the genus Myriophyllum having feathery underwater leaves and small inconspicuous flowers|