e. mach

Mach

[mahk; German mahkh]
noun
Ernst [ernst] , 1838–1916, Austrian physicist, psychologist, and philosopher.
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World English Dictionary
Mach1 (mæk)
 
n
short for Mach number

Mach2 (German max)
 
n
Ernst (ɛrnst). 1838--1916, Austrian physicist and philosopher. He devised the system of speed measurement using the Mach number. He also founded logical positivism, asserting that the validity of a scientific law is proved only after empirical testing

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Etymonline
Word Origin & History

Mach
measure of speed relative to the speed of sound (technically Mach number), 1937, named in honor of Austrian physicist Ernst Mach (1838-1916).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
Mach   (mäk, mäKH)  Pronunciation Key 
Austrian physicist and philosopher who experimented with supersonic projectiles and the flow of gases, obtaining early photographs of shock waves and gas jets. His work laid an important foundation for later developments in the science of projectiles and aeronautical design, and the Mach number and Mach bands were named for him.
The American Heritage® Science Dictionary
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