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From The Collaborative International Dictionary of English v.0.48 [gcide]:
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.
2. (Founding) A fault in a casting, produced by a bubble of air; a blowhole.
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.]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Air pocket \Air" pock"et\ (p[o^]k"[e^]t). (aeronautics) 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 hole}. [PJC.]
From WordNet (r) 3.0 (2006) [wn]:
noun
1: a local region of low pressure or descending air that causes a plane to lose height suddenly [syn: {air pocket}, {pocket}, {air hole}]
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Definitions retrieved from the Open Source DICT Webster's English and WordNet 3.0 dictionaries. Click here for database copyright information.
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