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thermal barrier

noun, Aeronautics, Rocketry.
the high temperatures produced by the friction between a supersonic object and the earth's atmosphere that limit the speed of an airplane or rocket.
Also called heat barrier.
Origin of thermal barrier
First recorded in 1950-55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for thermal barrier

thermal barrier

an obstacle to flight at very high speeds as a result of the heating effect of air friction Also called heat barrier
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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