/slʌdʒ / (say sluj)

1. mud, mire, or ooze; slush.
2. a deposit of ooze at the bottom of bodies of water.
3. any of various more or less mud-like deposits or mixtures.
4. the sediment in a steam boiler or water tank.
5. a later stage of sea freezing than frazil, in which the ice particles coagulate to form a thick, soupy surface layer having a matt appearance.
6. a mixture of some finely powdered substance and water.
7. sediment deposited during the treatment of sewage.
8. a fine, mud-like powder produced by a mining drill.
{Middle English slich slime; ? imitative}
sludgy, adjective

Australian English dictionary. 2014.