potamogeton

noun
pot·​a·​mo·​ge·​ton | \ˌpätəmōˈjēˌtän\

Definition of potamogeton 

1 capitalized : a large genus of aquatic herbs (family Potamogetonaceae) that are found in quiet waters throughout temperate regions and have spicate flowers with a four-parted perianth and usually floating leaves — see pondgrass, pondweed

2 plural -s : any plant of the genus Potamogeton

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History and Etymology for potamogeton

New Latin, from Latin, pondweed, from Greek potamogeitōn, from potamos river + geitōn neighbor

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