sargassum
noun
sar·gas·sum
sär-ˈga-səm 
: 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
Examples of sargassum in a Sentence
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Those regions can send matts of sargassum toward Florida on trade winds and ocean currents.
—
Bill Kearney, Sun Sentinel, 5 Aug. 2025
Warmer weather also means there will be a higher chance of blooms of yellow-brown sargassum seaweed washing ashore.
—Carley Rojas Avila, Travel + Leisure, 19 July 2025
How about sargassum, the foul-smelling seaweed that washes up on beaches in South Florida and around the world?
—Lew Sichelman, Miami Herald, 10 July 2025
Large sargassum deposits can block sunlight needed by coral reefs and sea grass meadows, while organisms within the wash die or are scavenged by birds.
—Sophie Clark, MSNBC Newsweek, 6 June 2025
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Bill Kearney, Sun Sentinel, 5 Aug. 2025
Warmer weather also means there will be a higher chance of blooms of yellow-brown sargassum seaweed washing ashore.
—Carley Rojas Avila, Travel + Leisure, 19 July 2025
How about sargassum, the foul-smelling seaweed that washes up on beaches in South Florida and around the world?
—Lew Sichelman, Miami Herald, 10 July 2025
Large sargassum deposits can block sunlight needed by coral reefs and sea grass meadows, while organisms within the wash die or are scavenged by birds.
—Sophie Clark, MSNBC Newsweek, 6 June 2025
See All Example Sentences for sargassum
Cite this Entry
“Sargassum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sargassum. Accessed 3 Nov. 2025.
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sargassum
noun
sar·gas·sum
sär-ˈgas-əm
: any of a genus of brown algae that have a leafy branching body and air bladders and that often grow in free-floating masses in the ocean
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