sargassum definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any of a genus (Sargassum, family Sargassaceae) of floating brown algae (order Fucales) found in tropical seas and having a main stem with flattened outgrowths like leaves, and branches with berry-like air sacs; gulfweed
Origin: Modern Latin ; from Portuguese sargaço ; from sarga, kind of grape
sargassum definition by American Heritage Dictionary
Origin: New Latin Sargassum, genus name, from sargasso.