Air hardening
noting any metal, especially alloy steel, that can be hardened from above its transformation point by cooling in air.
noun
a process of hardening high-alloy steels by heating and cooling in a current of air Compare oil hardening
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an area in enemy territory or in threatened friendly territory, seized by airborne troops for bringing in supplies and additional troops by airdrop or landing. Slang. a scatterbrained, stupid, or simple-minded person; dolt. Contemporary Examples Sure, the critics never quite cottoned to him; they always insinuated that he was an airhead, a blank. Are We […]
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a pneumatic hoist.
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an opening to admit or discharge air. a natural opening in the frozen surface of a river or pond. . Historical Examples At Mill Grove he came near losing his life, on a duck-shooting expedition, by falling through an air hole in the ice. Famous Men of Science Sarah K. Bolton There will be areas […]
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a horn activated by compressed air.
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a hose for conducting air under pressure, as one connected to an , an , or a scuba tank. Historical Examples With a shock of horror, the man heard the hiss of escaping air as Kreega’s beak and fingers finally worried the airhose loose. Duel on Syrtis Poul William Anderson His legs wrapped around the […]