1) Any seaweed of the same genus 2) Brown algae 3) Sargasso 4) Sargassum 5) Sargassum bacciferum 1) Sargasso 2) Sargassum 
[n] - brown algae with rounded bladders forming dense floating masses in tropical Atlantic waters as in the Sargasso Sea
sargassum noun brown algae with rounded bladders forming dense floating masses in tropical Atlantic waters as in the Sargasso Sea
a coarse, olive-brown, branching seaweed, Sargassum bacciferum, common in the Gulf Stream and tropical American seas, characterized by numerous berrylike air vessels. · any seaweed of the same genus.