Machmetern.
/ˈmakˌmiːtə/, /ˈmɑːkˌmiːtə/, /ˈmɑːxˌmiːtə/, U.S. /ˈmɑkˌmidər/ Aeronautics.
An air-speed indicator that reads directly in Mach numbers.
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society > travel > air or space travel > a means of conveyance through the air > aeroplane > parts of aircraft > controls and instruments > [noun] > meters for types of motion > meter indicating air-speed
clock1906
velometer1914
Machmeter1947
machometer1950
1947 Jrnl. Royal Aeronaut. Soc. 51 734/1 An instrument known as a Mach meter, which indicates the Mach number of flight at any height, has already been developed and is now being fitted in certain high-speed aircraft.
1948 ‘N. Shute’ No Highway xii. 305 What was the Machmeter showing?
1958 ‘P. Bryant’ Two Hours to Doom 118 He watched the Machmeter carefully as it moved up from point nine.
1964 J. E. D. Williams Operation of Airliners xx. 320 The indication of the Mach meter is not..instantaneously responsive to changes of engine thrust.
1975 L. J. Clancy Aerodynamics iii. 32 A Machmeter..depends on measurements of total and static pressure by the pitot-static tube.
1985 C. Yeager & L. Janos Yeager (1986) 165 The Machmeter aboard only registered to 1.0 Mach.
This entry has been updated (OED Third Edition, March 2000; most recently modified version published online March 2022).
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n.1947