Sealed or constructed so that air cannot pass through; completely resistant to air penetration.
Compound from 'air' and 'proof' (resistant to), following the pattern of 'waterproof' and 'soundproof' that became common in industrial English.
Airproof sealing is critical in everything from spacecraft to refrigerators—the concept touches almost every modern technology, yet most people never think about the engineering genius behind it.
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