from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An explosive sound caused by the shock wave preceding an aircraft traveling at or above the speed of sound.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The audible effect of a shock wave in the air, especially one caused by an aircraft flying faster then the speed of sound
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an explosive sound caused by the shock wave of an airplane traveling faster than the speed of sound
Sorry, no etymologies found.
The Blackbird departed Edwards AFB, California, refueled over the ocean, then overflew the base, leaving a sonic boom in its wake.