Definition of sargassum
: any of a genus (Sargassum) of brown algae that have a branching thallus with lateral outgrowths differentiated as leafy segments, air bladders, or spore-bearing structures : gulfweed
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Origin and Etymology of sargassum
New Latin, genus name, from International Scientific Vocabulary sargasso
First Known Use: circa 1890
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Britannica.com: Encyclopedia article about sargassum
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