sea·weed (s  wd )n. 1. Any of numerous marine algae, such as a kelp, rockweed, or gulfweed. 2. Any of various marine plants. |
seaweed [ˈsiːˌwiːd]
n
1. (Life Sciences & Allied Applications / Plants) any of numerous multicellular marine algae that grow on the seashore, in salt marshes, in brackish water, or submerged in the ocean
2. (Life Sciences & Allied Applications / Plants) any of certain other plants that grow in or close to the sea
| seaweed (swd) 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. See more at brown algagreen algared alga |   top left to right: Irish moss and horsetail kelp; bottom left to right: sugar kelp and bladder wrack |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  seaweed - plant growing in the sea, especially marine algaealga, algae - primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves arame - an edible seaweed with a mild flavor wrack - dried seaweed especially that cast ashore seagrass - any of various seaweeds that grow underwater in shallow beds; "seagrass provides a protective environment in which young fish can develop" |
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