Pronunciation: (mäk), [key]
a number indicating the ratio of the speed of an object to the speed of sound in the medium through which the object is moving. Abbr.: M Also,Mach.Also called mach number, Mach number. [after E. Mach]
Pronunciation: (mäk; Ger. mäkh), [key]
Ernst Pronunciation: (ernst), [key] 1838–1916, Austrian physicist, psychologist, and philosopher.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.