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|Noun||1.||Myriophyllum - chiefly monoecious and usually aquatic herbs (as the milfoils)|
dicot genus, magnoliopsid genus - genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination
family Haloragaceae, family Haloragidaceae, Haloragaceae, Haloragidaceae, water-milfoil family - a family of dicotyledonous plants of the order Myrtales
water milfoil - an aquatic plant of the genus Myriophyllum having feathery underwater leaves and small inconspicuous flowers