Sargasso \Sar*gas"so\, n. [Sp. sargazo seaweed.] (Bot.) The gulf weed. See under {Gulf}. {Sargasso Sea}, a large tract of the North Atlantic Ocean where sargasso in great abundance floats on the surface.
Sargasso Sea n : a vast area of the North Atlantic from the West Indies to the Azores that is dense with gulfweed