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1. See sonic barrier.
2. A set of tall barriers placed along a road or highway to muffle the sound of traffic.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Aeronautics) (not in technical usage) a hypothetical barrier to flight at or above the speed of sound, when a sudden large increase in drag occurs. Also called: sonic barrier or transonic barrier
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
an abrupt increase in drag experienced by an aircraft approaching the speed of sound.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
The sudden, sharp increase in drag experienced by aircraft approaching the speed of sound. Also called sonic barrier.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||sound barrier - the increase in aerodynamic drag as an airplane approaches the speed of sound|
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