backdraft

backdraft

[bak-draft, -drahft]
noun
an explosive surge in a fire produced by the sudden mixing of air with other combustible gases.

Origin:
1815–25; back2 + draft

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World English Dictionary
backdraught or (US), (Canadian) backdraft (ˈbækˌdrɑːft)
 
n
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
 
backdraft or (US), (Canadian) backdraft
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Dictionary.com's 21st Century Lexicon
Main Entry:  backdraft
Part of Speech:  n
Definition:  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
Dictionary.com's 21st Century Lexicon
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