Any of several brownish seaweeds of the genus Sargassum having rounded air bladders and often forming dense, floating masses in the Atlantic Ocean.
A brown algae (genus Sargassum) with berrylike air sacs, found floating in the Gulf Stream, Pacific Ocean, etc.
Other Word Forms
Origin of gulfweed
- After the Gulf of Mexico
From American Heritage Dictionary of the English Language, 5th Edition