'Sargassum' definitions:

Definition of 'sargassum'

From: WordNet
noun
Brown algae with rounded bladders forming dense floating masses in tropical Atlantic waters as in the Sargasso Sea [syn: gulfweed, sargassum, sargasso, Sargassum bacciferum]

Definition of 'Sargassum'

From: GCIDE
  • Sargassum \Sar*gas"sum\, n. [NL.] A genus of algae including the gulf weed. [1913 Webster]