Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A set of tall barriers placed along a road or highway to muffle the sound of traffic.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun uncountable The apparent
physical boundary (caused by a sudden increase indrag )preventing objects from becomingsupersonic . - noun countable A
structure beside ahighway designed to reduce thenoise of traffic.
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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