1. Sargasso Sea - Noun
2. Sargasso Sea - Proper noun
a vast area of the North Atlantic from the West Indies to the Azores that is dense with gulfweed
Source: WordNetBegun as a Sargasso Sea pilot sampling project in August 2003, Venter announced the full Expedition on 4 March 2004. Source: Internet
By this time the Portuguese navigators had also reached the Sargasso Sea (western North Atlantic region), naming it after the Sargassum seaweed growing there (sargaço / sargasso in Portuguese). Source: Internet