Sargassum definitions

sär-găs'əm
Any of a genus (Sargassum, family Sargassaceae) of floating brown algae (order Fucales) found in tropical seas and having a main stem with flattened outgrowths like leaves, and branches with berry-like air sacs; gulfweed.
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Any of many brown algae of the genus Sargassum; gulfweed.
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Origin of sargassum

New Latin Sargassum genus name from sargasso