from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A floating mass of vegetation that often obstructs navigation in tropical rivers.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A floating mass of plant matter, such as reeds, which obstructs boat passage on the Nile
from the GNU version of the Collaborative International Dictionary of English
- n. A tangled mass of floating vegetal matter obstructing navigation.
from The Century Dictionary and Cyclopedia
- n. An impenetrable mass of floating water-plants interlaced with trunks of trees and decayed vegetable matter, forming floating islands in the White Nile.
- n. See sadd.
Arabic, obstruction, sudd, from sadda, to obstruct; see šdd in Semitic roots.(American Heritage® Dictionary of the English Language, Fourth Edition)