seaweed

n. plant or alga which grows in the sea

For the band, see; Seaweed (band)For the rock musician, see; Seaweed (musician) Seaweeds are any of a large number of marine benthic algae. They are macroscopic and multicellular, in contrast with most other algae. Seaweeds areoften found in the seashore biome.
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Noun
1. plant growing in the sea, especially marine algae
(hypernym) alga, algae
(hyponym) arame

(n.)
Popularly, any plant or plants growing in the sea.
  

(n.)
Any marine plant of the class Algae, as kelp, dulse, Fucus, Ulva, etc.
  

Synonyms and related words:
algae, autophyte, bean, bracken, brown algae, climber, conferva, confervoid, creeper, diatom, fern, fruits and vegetables, fucus, fungus, grapevine, green algae, gulfweed, herb, heterophyte, ivy, kelp, legume, lentil, liana, lichen, liverwort, mold, moss, mushroom, parasite, parasitic plant, pea, perthophyte, phytoplankton, planktonic algae, plant families, puffball, pulse, red algae, rockweed, rust, saprophyte, sargasso, sargassum, sea lentil, sea moss, sea wrack, smut, succulent, toadstool, vetch, vine, wort, wrack