Encyclopedia > Seaweed

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Seaweed refers, loosely, to any of a large number of marine algae, especially those which float near the surface of the water. These are divided among the red, green, and brown algae.

The term is named after terrestrial weed, and not to be confused with seagrass.


Seaweeds have an appearance that resembles a non-arboreal terrestrial plants.


Some of them are used as food. For example, nori is a red alga dried, formed into sheets, and used to wrap sushi. Irish moss is another red alga used in producing various food additives. Other seaweeds may be used as seaweed fertiliser.

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