[sar.gas.sum] n [NL, genus name, fr. ISV sargasso] (ca. 1890): 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
SARGASSUM
Meaning of SARGASSUM in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012