machmeter

[ mahk-mee-ter, mak- ]
/ ˈmɑkˌmi tər, ˈmæk- /

noun Aeronautics.

a device that indicates airspeed relative to the speed of sound.

Origin of machmeter

British Dictionary definitions for machmeter

Machmeter
/ (ˈmækˌmiːtə) /

noun

an instrument for measuring the Mach number of an aircraft in flight