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Etymology

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ribbon +‎ weed

Noun

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ribbonweed (usually uncountable, plural ribbonweeds)

  1. Any of various marine and freshwater flowering plants:
    1. Species of Posidonia
    2. Zostera capricorni
    3. Ribbonleaf pondweed, Potamogeton epihydrus
    4. Stuckenia pectinata (Potamogeton pectinatus)
    5. Species of Vallisneria