any of various aquatic plants, chiefly of the genus Myriophyllum, the submerged leaves of which are very finely divided.
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Origin of water milfoil
First recorded in 1570–80
Words nearby water milfoil
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for water milfoil
any of various pond plants of the genus Myriophyllum, having feathery underwater leaves and small inconspicuous flowers: family Haloragidaceae