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PONDWEED
Any aquaticplant of the genus Potamogeton, of which much species are found in ponds or slow-moving rivers. Choke pondweed, an American waterweed (Anarcharis, or Elodea, Canadensis) See Anacharis. Horned pondweed, the Zannichellia palustris, a slender, branchingaquatic plant, having pointed nutlets.
Source: Websters Vocabulary