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Impermeable to (especially poisonous) gas; gas-tight.
with object To make (an enclosure, material, etc.) gas-proof.
Mid 19th century; earliest use found in Boston Daily Atlas. From gas + proofmid 19th century. From gas-proof.
Mid 19th century; earliest use found in Boston Daily Atlas. From gas + proof<br>mid 19th century. From gas-proof.
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