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.]
Farlex Partner Medical Dictionary © Farlex 2012

scum

(skŭm) [ME. scume]
Slimy floating islands of bacteria or impurities on the surface of a culture; an interrupted pellicle of bacterial growth.
Medical Dictionary, © 2009 Farlex and Partners