Synonym: trash. Similar words: cum, scud, cecum, cumin, scuff, scull, acumen, talcum. Meaning: [skʌm] 
n. 1. worthless people 2. a film of impurities or vegetation that can form on the surface of a liquid. v. remove the scum from.
n. 1. worthless people 2. a film of impurities or vegetation that can form on the surface of a liquid. v. remove the scum from. 
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91. Years later, I learned an English word in Farsi can not find the corresponding word can be used to describe the kind of scum Aseff: anti-social elements.
92. I skimmed the milk scum off the top with a piece of bread.
93. Oh my. You mean the Chinese don't welcome child rapists. What dirty commie scum they must be. LOL.
94. Hence ExxonMobil's $600 million research foray into car fuel made from pond scum, and Shell's decision to freeze all other investment in renewables to focus on biofuels.
95. Toxic cyanobacteria, commonly referred to as pond scum , turned the big lake fluorescent green.
96. Daniel Kammen : A variety of algae, actually the common pond scum to various plants cell walls.
97. This is a sea dragon, and the one on the bottom, the blue one, is a juvenile that has not yet swallowed the acid, has not yet taken in the brown-green algae pond scum into its body to give it energy.
98. Experimental results showed that after treated by deflocculation, flocs of oily air-flotation scum was broken completely, dehydration property and fluidity were markedly improved.
99. So why not replace it with something cheap and plentiful that has no practical value anyplace else?Like, say, pond scum?