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 ?
It was the scummiest collection of pond life since the last National Front march.
While the message is that good girls should stay home, it immerses viewers for two hours in tawdry offal that most likely would be rejected by the scummiest of the soap operas.