scum

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scum

(skŭm),
A film of insoluble material that rises to the surface of a liquid, as in epistasis.
[M.E.]

scum

(skŭm) [ME. scume]
Slimy floating islands of bacteria or impurities on the surface of a culture; an interrupted pellicle of bacterial growth.
References in periodicals archive ?
I'm not glorifying him, but I think criminal gangs today are a far scummier bunch of psychopaths than Martin Cahill ever was.
I find Pinter's relentless trawl through the scummier side of human nature depressing and I think most real people are capable of delivering fully fledged sentences more often than he allows, but this is a great play.