air pocket
American Heritage Dictionary:
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air pocket
n.
A downward air current that causes an aircraft to lose altitude abruptly. Also called air hole.
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An air-filled volume within a section of piping (or an apparatus) which is normally filled with liquid.
McGraw-Hill Dictionary of Aviation:
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air pocket
An area of reduced pressure in the air in which the aircraft looses height rapidly and creates an illusion of absence of air to support the aircraft. The resultant effect is rather unpleasant. An air pocket can also produce the reverse effect, but the experience is not as unpleasant.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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McGraw-Hill Dictionary of Architecture & Construction
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. All rights reserved.
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