The process or action of removing or reducing foam; the act of defoaming.
From defoam + -ing (gerund suffix). The -ing suffix creates nouns from verbs, or marks present participles.
In technical writing, 'defoaming' becomes a countable noun—engineers talk about 'defoaming methods' or 'defoaming efficiency,' showing how gerunds become standardized terminology in specialized fields where you need to discuss processes as abstract concepts.
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