n. Any of many brown algae of the genus Sargassum; gulfweed
the GNU version of the Collaborative International Dictionary of English
n. A genus of algæ including the gulf weed.
The Century Dictionary and Cyclopedia
n. A genus of marine algæ, of the class Fucaceæ, having fronds attached by a disk, and branching stems with the fronds provided with a midrib and distinctly stalked air-bladders.
n. [lowercase] Gulfweed.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. brown algae with rounded bladders forming dense floating masses in tropical Atlantic waters as in the Sargasso Sea
Word Usage
"That's where lots of stuff that floats ends up, including golden seaweed called sargassum, which is prime feeding ground for lots of animals, including young turtles."