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So tight as to be impermeable to air; as, an air-tight cylinder.

A jacket having air-tight cells, or cavities which can be filled with air, to render persons buoyant in swimming.

A short glass jar fitted with an air-tight cover, and containing some desiccating agent, as sulphuric acid or calcium chloride, above which is suspended the material to be dried, or preserved from moisture.

An air-tight compartment in which vapor may be generated to destroy germs or insects; esp., the apparatus used to destroy San José scale on nursery stock, with hydrocyanic acid vapor.

Oak given a weathered appearance by exposure in an air-tight compartment to fumes of ammonia from uncorked cans, being first given a coat of filler.

Made perfectly close or air-tight by fusion, so that no gas or spirit can enter or escape; as, an hermetic seal. See Note under Hermetically. Hermetic art, alchemy. -- Hermetic books. (a) Books of the Egyptians, which treat of astrology. (b) Books which treat of universal principles, of the nature and orders of celest…

By fusion, so as to form an air-tight closure.

t room; -- often used in this sense as the second member of a compound; as, water- tight; air-tight.