Part of speech: noun

Impure matter that rises to the surface of boiling or fermenting liquids; froth; refuse.

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Usage examples "scum":

  1. Young Lee, limp and dripping like a broken water- plant, was stretched upon the sofa, the green scum of the river upon his black hair, and a fringe of white foam upon his leaden- hued lips. - "Round the Red Lamp Being Facts and Fancies of Medical Life", Arthur Conan Doyle.
  2. Skim off the brown scum, all the time it is boiling. - "Seventy-Five Receipts for Pastry Cakes, and Sweetmeats", Miss Leslie.
  3. She'd had some words, she said, with her mistress, and didn't propose to be treated like the scum of the earth by anybody. - "The Prairie Mother", Arthur Stringer.