from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The sudden sharp increase in aerodynamic drag experienced by aircraft approaching the speed of sound. Also called sound barrier.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. sound barrier
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the increase in aerodynamic drag as an airplane approaches the speed of sound
Sorry, no etymologies found.