- a film or layer of foul or extraneous matter that forms on the surface of a liquid.
- refuse or offscourings.
- a low, worthless, or evil person.
- such persons collectively; riffraff; dregs.
- scoria (def. 1).
- to remove the scum from.
- to remove as scum.
- to form scum; become covered with scum.
- a layer of impure matter that forms on the surface of a liquid, often as the result of boiling or fermentation
- the greenish film of algae and similar vegetation surface of a stagnant pond
- the skin of oxides or impurities on the surface of a molten metal
- waste matter
- a worthless person or group of people
- to remove scum from
- to form a layer of or become covered with scum
