milfoil : Idioms & Phrases
Water milfoil
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noun an aquatic plant of the genus Myriophyllum having feathery underwater leaves and small inconspicuous flowers
WordNet
(Bot.) , an aquatic herb with dissected leaves (Myriophyllum ).
Webster 1913
water-milfoil family
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noun a family of dicotyledonous plants of the order Myrtales
Haloragidaceae; family Haloragidaceae; Haloragaceae; family Haloragaceae.