Air hole

Webster's Dictionary of the English Language

·- A fault in a casting, produced by a bubble of air; a blowhole.

II. Air hole ·- A hole to admit or discharge air; specifically, a spot in the ice not frozen over.

III. Air hole ·add. ·- A local region in the atmosphere having a downward movement and offering less than normal support for the sustaining surfaces of a flying machine.

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