To remove foam from something; to reduce or eliminate foam.
From de- (remove) + foam (bubbles of gas in liquid). Foam comes from Old English fam, a Germanic word. The de- prefix creates the verb meaning to remove foam.
Defoaming is a serious industrial process—foam interferes with manufacturing, pumping, and chemical reactions, so chemists developed anti-foaming agents and defoaming procedures that are essential to everything from oil refining to beer production.
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