sargassum
Concise Oxford English Dictionary © 2008 Oxford University Press:
sargassum /sɑːˈgasəm/ (also sargasso)
▶noun a brown seaweed with berry-like air bladders, typically floating in large masses. [Genus Sargassum.]
– origin C16 (as sargasso): mod. L., from Port. sargaço, of unknown origin.
'sargassum' also found in these Oxford entries:
