seaweed

Etymology

sea + weed

noun

  1. Any of numerous marine plants and algae, such as a kelp.
    The tide was out, and we drew up amid the strong bracing smell of seaweed, with gulls screeching, wheeling around, and gliding on the wind. 1947 January and February, O. S. Nock, “"The Aberdonian" in Wartime”, in Railway Magazine, page 8
  2. (by extension) Any of various fresh water plants and algae.
    With light penetrating to the lake bottom, beds of seaweed flourished where little had grown before. 1995, Dan McCosh, “Aliens among us”, in Popular Science, page 94

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