noun

• A brown alga, of the genus Sargassum, that forms large, floating masses.
• (figuratively) Also Sargasso: a confused, tangled mass or situation.
• (biology, oceanography) A part of an ocean or sea characterized by floating masses of sargassos, like the Sargasso Sea.
• (figuratively) Also sargasso: a confused, tangled mass or situation.
• Short for Sargasso Sea. [An elongated area in the middle of the North Atlantic Ocean, surrounded by ocean currents.]