Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of numerous marine algae, such as a kelp, rockweed, or gulfweed.
  • noun A mass of such algae.

from The Century Dictionary.

  • noun Any plant or plants growing in the sea; more particularly, any member of the class Algæ.

from the GNU version of the Collaborative International Dictionary of English.

  • noun Popularly, any plant or plants growing in the sea.
  • noun (Bot.) Any marine plant of the class Algæ, as kelp, dulse, Fucus, Ulva, etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Any of numerous marine plants and algae, such as a kelp.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun plant growing in the sea, especially marine algae

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

sea +‎ weed

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