Seaweed meaning

sē'wēd'
Seaweed is a water plant, especially saltwater algae.

An example of seaweed is kelp.

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Any similar freshwater plant.
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Any of numerous marine algae, such as a kelp, rockweed, or gulfweed.
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A mass of such algae.
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Any of various red, green, or brown algae that live in ocean waters. Some species of seaweed are free-floating, while others are attached to the ocean bottom. Seaweed range from the size of a pinhead to having large fronds (such as those of many kelps) that can be as much as 30.5 m (100 ft) in length. Certain species are used for food (such as nori) and fertilizer, and others are harvested for carrageenan and other substances used as thickening, stabilizing, emulsifying, or suspending agents in industrial, pharmaceutical, and food products. Seaweed is also a natural source of the element iodine, which is otherwise found only in very small amounts.
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Any of numerous marine plants and algae, such as a kelp.
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Any of numerous marine algae, such as a kelp, rockweed, or gulfweed.
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A mass of such algae.
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Any sea plant or plants; esp., any marine alga, as kelp.
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Origin of seaweed