01 A hole to admit or discharge air; specifically, a spot in the ice not frozen over.
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1.
A hole to admit or discharge air; specifically, a spot in the ice not frozen over.
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2.
A fault in a casting, produced by a bubble of air; a blowhole.(Founding)
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3.
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.(Aëronautics) Also: air pocket