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Air hole | Air hole \Air" hole`\ ([^a]r" h[=o]l`). 1. A hole to admit or discharge air; specifically, a spot in the ice not frozen over. [1913 Webster] 2. (Founding) A fault in a casting, produced by a bubble of air; a blowhole. [1913 Webster] 3. (A["e]ronautics) A local region in the atmosphere having a downward movement and offering less than normal support for the sustaining surfaces of a flying machine, causing an airplane to drop suddenly. Same as {air pocket}. [Webster 1913 Suppl.] |
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