Main Entry: ¹scum

Pronunciation: \ˈskəm\

Function: noun

Etymology: Middle English, from Middle Dutch schum; akin to Old High German scūm foam

Date: 14th century

1 a : extraneous matter or impurities risen to or formed on the surface of a liquid often as a foul filmy covering — compare pond scum 2 b : the scoria of metals in a molten state : dross c : a slimy film on a solid or gelatinous object
2 a : refuse b : a low, vile, or worthless person or group of people

— scum·my \ˈskə-mē\ adjective