| Pronunciation: | | ehr 'pâkit
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 WordNet Dictionary |
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| | Definition: | | [n] a local region of low pressure or descending air that causes a plane to lose height suddenly |
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| | See Also: | | atmospheric phenomenon |
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| Thesaurus Terms |
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| | Related Terms: | | aerospace, aerosphere, air hole, airspace, bump, CAT, ceiling, crosswind, empty space, favorable wind, fog, front, head wind, high-pressure area, hole, ionosphere, jetstream, low-pressure area, overcast, pocket, roughness, soup, space, stratosphere, substratosphere, tail wind, tropopause, troposphere, trough, turbulence, visibility, visibility zero |
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