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air lock an airtight compartment in which the air pressure can be regulated, usu. situated between two areas that have different air pressures, as in underwater operations. [1/2 definitions]
gasket any of numerous rings, seals, or the like used to make a joint watertight or airtight, as in a pipe or machine.
hermetic preventing or sealed to prevent the influx or escape of air; airtight. [1/3 definitions]
pressure cooker a heavy, airtight metal pot in which steam under pressure cooks food quickly and at a very high temperature. [1/2 definitions]
pressure suit an airtight suit that, when inflated, maintains for its wearer normal atmospheric pressure at high altitudes, in space, or the like.
shrink-wrap to cover (a product) in a clear plastic film that shrinks upon exposure to heat and forms an airtight seal. [1/2 definitions]