Definition of sargassum in US English:


(also sargassum weed)


  • A brown seaweed with berrylike air bladders, typically forming large floating masses.

    Genus Sargassum, class Phaeophyceae

    • ‘Patches of sargassum weed can be fish magnets’
    • ‘Hatchlings that successfully make the trek from their nests to the relative safety of the gulf and ocean waters find sanctuary from predators in large, floating beds of sargassum seaweed far offshore.’
    • ‘They are also frequently found in floating sargassum weed, which suggests that they are common offshore.’
    • ‘Most photosynthetic life (life that uses light energy to convert carbon dioxide and water into food), such as phytoplankton and floating sargassum, is found in this region.’
    • ‘It is well known that large floating objects like buoys, logs or sargassum weed often attract large numbers of fish.’


Modern Latin, from Portuguese sargaço (see sargasso).