de sludge

sludge

[sluhj]
noun
1.
mud, mire, or ooze; slush.
2.
a deposit of ooze at the bottom of a body of water.
3.
any of various more or less mudlike deposits or mixtures.
4.
the sediment in a steam boiler or water tank.
5.
broken ice, as on the sea.
6.
a mixture of some finely powdered substance and water.
7.
sediment deposited during the treatment of sewage.
8.
Also called activated sludge. Bacteriology. sewage sediment that contains a heavy growth of microorganisms, resulting from vigorous aeration.
9.
a fine, mudlike powder produced by a mining drill.

Origin:
1640–50; variant of dial. slutch, slitch, Middle English slich slime, wet mud (compare its derivative slucched muddy); apparently of expressive orig.

de-sludge, verb (used with object), de-sludged, de-sludging.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
sludge (slʌdʒ)
 
n
1.  soft mud, snow, etc
2.  any deposit or sediment
3.  a surface layer of ice that has a slushy appearance
4.  (in sewage disposal) the solid constituents of sewage that precipitate during treatment and are removed for subsequent purification
 
[C17: probably related to slush]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

sludge
1649, possibly from M.E. slutch "mud, mire," or a variant of slush.
Online Etymology Dictionary, © 2010 Douglas Harper
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