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backdraft

[bak-draft, -drahft] /ˈbækˌdræft, -ˌdrɑft/
noun
1.
an explosive surge in a fire produced by the sudden mixing of air with other combustible gases.
Origin
1815-1825
1815-25; back2 + draft
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for backdraft

backdraught

/ˈbækˌdrɑːft/
noun
1.
a reverse movement of air, gas, or liquid
2.
an explosion that occurs when air reaches a fire that has used up all the available oxygen, often occurring when a door is opened to the room containing the fire
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Contemporary definitions for backdraft
noun

a sweep of air backwards; also, a condition in a fire where oxygen is depleted and the fire dies down until a door is opened and the fire flares violently from the intake of oxygen

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