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air hole
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- Air hole - - A hole to admit or discharge air; specifically, a spot in the ice not frozen over.
- Air hole - - A fault in a casting, produced by a bubble of air; a blowhole.
- Blowhole - n. - An air hole in a casting.
- Air bladder - - A sac or bladder full of air in an animal or plant; also an air hole in a casting.