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usually uncountable, plural seaweeds
Any of numerous marine plants and algae, such as a kelp. quotations examples
We have lingered in the chambers of the sea / By sea-girls wreathed with seaweed red and brown / Till human voices wake us, and we drown.
1915 June, T[homas] S[tearns] Eliot, “The Love Song of J. Alfred Prufrock”, in Prufrock and Other Observations, London: The Egotist […], published 1917, page 16
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
(by extension) Any of various fresh water plants and algae. quotations examples
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