Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The sudden sharp increase in aerodynamic drag experienced by aircraft approaching the speed of sound.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun
sound barrier
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the increase in aerodynamic drag as an airplane approaches the speed of sound
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