noun
Usage: usually capitalized M
Etymology: after Ernst Mach
: the conical pressure wave front produced by a body moving at a speed greater than that of sound
noun
Usage: usually capitalized M
Etymology: after Ernst Mach
: the conical pressure wave front produced by a body moving at a speed greater than that of sound
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012