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 ?
The very first game I took charge there, they were calling me a Scummer, I misheard and thought they were saying something bad about me being a Scouser.
They can accuse me of this and that, call me a scummer, whatever they like, but it's like water off a duck's back.
PAYE up Pompey" read the banners, as the Scummers and Skates competed for bragging rights.