A substance added to liquids to prevent or reduce foam and bubbles, commonly used in industrial and chemical processes.
From anti- + foam. Industrial chemistry term developed in the 20th century for defoaming agents used in manufacturing.
Your shampoo probably has antifoam in it backwards—wait, no, shampoo makes foam! But oil refineries, breweries, and chemical plants add antifoam to break down unwanted bubbles that can mess up their processes.
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