Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Semisolid material such as the type precipitated by sewage treatment.
  • n. Mud, mire, or ooze covering the ground or forming a deposit, as on a riverbed.
  • n. Finely broken or half-formed ice on a body of water, especially the sea.
  • n. An agglutination or aggregation of blood cells forming a semisolid mass that often impedes circulation.
  • intransitive v. To agglutinate or aggregate into a semisolid mass; form a sludge. Used of blood cells.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A generic term for solids separated from suspension in a liquid.
  • n. A residual semi-solid material left from industrial, water treatment, or wastewater treatment processes.
  • n. A sediment of accumulated minerals in a steam boiler.
  • n. A mass of small pieces of ice on the surface of a body of water.
  • v. to slump or slouch.
  • v. to slop or drip slowly.

from the GNU version of the Collaborative International Dictionary of English

  • n. Mud; mire; soft mud; slush.
  • n. Small floating pieces of ice, or masses of saturated snow.
  • n. See Slime, 4.
  • n. Anything resembling mud or slush; as: (a) A muddy or slimy deposit from sweage. (b) Mud from a drill hole in boring. (c) Muddy sediment in a steam boiler. (d) Settling of cottonseed oil, used in making soap, etc. (e) A residuum of crude paraffin-oil distillation.

from The Century Dictionary and Cyclopedia

  • n. Mud; mire.
  • n. A pasty mixture of snow or ice and water; half-melted snow; slush.
  • n. In mining, the fine powder produced by the action of the drill or borer in a bore-hole, when mixed with water, as is usually the case in large and deep bore-holes. The powder when dry is often called bore-meal.
  • n. Refuse from various operations, as from the washing of coal; also, refuse acid and alkali solutions from the agitators, in the refining of crude petroleum: sometimes used, but incorrectly, as the equivalent of slimes, or the very finely comminuted material coming from the stamps. See Slime, 3.
  • n. The more or less viscid mud thrown down from dilute waste soap-liquors of wool-scouring, cotton-bleaching, and dyeing industries when such liquors are treated with crude aluminium sulphate and milk of lime. The remaining effluent is thus in a large measure purified, but the sludge thrown down has usually little value, even as a manure.
  • n. The precipitated solid matter in sewage, usually collected in settling-basins in sewage-disposal works after chemical treatment and filtration. Often pressed into cakes.
  • n. The sediment, in the form of a mud, which collects in a steam-boiler.
  • n. Incorrectly, by abbreviation, an opening in a steam-boiler for the removal of sludge or mud; also, the lid which covers such an opening.
  • n. A sand-pump or mud-pumping device for removing sludge from a sink or a bore-hole.
  • n. The silt-like deposit in the bottom of an electrolytic cell.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the precipitate produced by sewage treatment
  • n. any thick, viscous matter

Etymologies

Perhaps alteration of dialectal slutch, mire.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

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