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Etymology

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From pond +‎ weed.

Noun

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pondweed (countable and uncountable, plural pondweeds)

  1. Any of several plants that grow in ponds or similar aquatic conditions:
    1. (most commonly) Potamogeton, a diverse and worldwide genus
    2. Elodea, found in North America
    3. Azolla, of cosmopolitan distribution
      • 2018, Tim Flannery, Europe: A Natural History, page 76:
        If you have ever had a pond you will know Azolla, a.k.a. pondweed, duckweed fern or fairy moss.
    4. Aponogeton, in Africa, Asia and Australasia
    5. opposite-leaved pondweed, Groenlandia densa, only plant of its genus, found chiefly in the Mediterranean region.
  2. Charales, an order of green algae

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