Water-milfoil definitions

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.
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Any of a genus (Myriophyllum, family Haloragaceae) of graceful, feathery dicotyledonous plants (order Haloragales) growing under water: used in aquariums.
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