sargassum
/sɑrˈɡæsəm/
noun
- A genus of brown seaweed that floats in large masses on the surface of warm ocean waters, especially in the Sargasso Sea.
- Sargassum provides essential habitat for fish, crabs, and shrimp in the open ocean.
- Beaches in the Caribbean sometimes get covered with washed-up sargassum.
- The boat's engine got tangled in a thick mat of sargassum.
Synonyms