scum

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Related to scums: scummiest

scum

1. the greenish film of algae and similar vegetation surface of a stagnant pond
2. the skin of oxides or impurities on the surface of a molten metal

scum

[skəm]
(materials)
A film of impurities that rises to or is formed on the surface of a liquid.
A slimy film formed on the surface of a solid object.

scum, scumming

1. A surface deposit sometimes formed on clay bricks; caused either by soluble salts in the clay which migrate to the surface as moisture escapes during drying (drier scum) or by the formation of deposits during kiln firing (kiln scum).
2. A mass of organic matter which floats on the surface of sewage.
References in periodicals archive ?
Because the highest concentrations of toxins are found in shoreline locations where scums can form, and the shorelines are where most people recreate, the Rubenstein Lab has developed a special program focused on these locations.
These areas are open for recreation, but caution is advised in any areas where dense accumulations or scums are apparent.
The water is not safe for recreational use in areas that contain scums.