sludge Meaning, Definition & Usage

  1. noun the precipitate produced by sewage treatment
  2. noun any thick, viscous matter
    goo; gunk; guck; gook; slime; muck; ooze; goop.

WordNet

Sludge noun
Etymology
CF. Slush.
Definitions
  1. Mud; mire; soft mud; slush. Mortimer. Tennyson.
  2. Small floating pieces of ice, or masses of saturated snow. Kane.
  3. (Mining) See Slime, 4.

Webster 1913