from The American Heritage® Dictionary of the English Language, 4th Edition
- A part of the northern Atlantic Ocean between the West Indies and the Azores. The relatively calm sea is noted for the abundance of gulfweed floating on its surface.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. An elongated area in the middle of the North Atlantic Ocean, surrounded by ocean currents.
from the GNU version of the Collaborative International Dictionary of English
- n. a large tract of the North Atlantic Ocean where sargasso in great abundance floats on the surface.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a vast area of the North Atlantic from the West Indies to the Azores that is dense with gulfweed
Sorry, no etymologies found.
It was also rumoured that German engineers were secretly building a durable, concrete landmass in the Sargasso Sea which was to be the new Atlantis and, it was said, would be a threat to French East Africa; but it seems that this went no further than laying the foundations.