sudd

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sudd

 (sŭd)
n.
A floating mass of vegetation that obstructs navigation in tropical rivers, found chiefly in upper portions of the Nile River.

[Arabic, obstruction, sudd, from sadda, to obstruct; see šdd in the Appendix of Semitic roots.]

sudd

(sʌd)
n
(Botany) floating masses of reeds and weeds that occur on the White Nile and obstruct navigation
[C19: from Arabic, literally: obstruction]

sudd

(sʌd)

n.
(in the White Nile) floating vegetable matter that often obstructs navigation.
[1870–75; < Arabic: literally, obstruction]