- noun a mucous substance secreted by an organism such as a snail
- noun a coating of green algae on rocks or other surfaces
- noun any thick liquid substance regarded as unpleasant
- In electrolytic refining or plating, an insoluble residue that collects at the bottom of the solution or on the surface of the anode. In the electrolytic refining of copper, for example, this mud usually contains platinum, gold, and silver. Also called anode mud, or anode slime.
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