World English Dictionary
scum (skʌm)
1.  a layer of impure matter that forms on the surface of a liquid, often as the result of boiling or fermentation
2.  the greenish film of algae and similar vegetation surface of a stagnant pond
3.  dross, Also called: scruff the skin of oxides or impurities on the surface of a molten metal
4.  waste matter
5.  a worthless person or group of people
vb , scums, scumming, scummed
6.  (tr) to remove scum from
7.  rare (intr) to form a layer of or become covered with scum
[C13: of Germanic origin; related to Old High German scūm, Middle Dutch schūm, Old French escume; see skim]

Collins English Dictionary - Complete & Unabridged 10th Edition
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