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 classic literature ?
Endowed with an iron frame and a stout heart, how would he have disappointed his enemies if they could only have seen, in the dark cell of the Buytenhof, his pale face lit up by the smile of the martyr, who forgets the dross of this earth after having obtained a glimpse of the bright glory of heaven.
Affecting private life, or more obscure In savage wilderness, wherefore deprive All Earth her wonder at thy acts, thyself The fame and glory--glory, the reward That sole excites to high attempts the flame Of most erected spirits, most tempered pure AEthereal, who all pleasures else despise, All treasures and all gain esteem as dross, And dignities and powers, all but the highest?
Gold and silver we will tell them that they have from God; the diviner metal is within them, and they have therefore no need of the dross which is current among men, and ought not to pollute the divine by any such earthly admixture; for that commoner metal has been the source of many unholy deeds, but their own is undefiled.