The process of removing air from a substance, typically a liquid like concrete, paint, or resin, to eliminate air bubbles and improve quality.
From 'de-' (prefix meaning 'to remove') plus 'air' plus '-ing.' 'Air' comes from Old English 'ær' via Latin 'aer' (from Greek). The prefix 'de-' has Germanic roots.
Concrete workers and resin artists obsess over deairing because even tiny air pockets weaken structures or create imperfections—it's why vacuum chambers are used in manufacturing high-performance materials.
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