Machmeter (plural Machmeters)
- An instrument that measures the speed of an aircraft relative to that of sound and displays it in Mach numbers
2012, Aviation Maintenance Technician Handbook-Airframe Volume 2:
- Many high performance aircraft are equipped with a Machmeter for monitoring Mcrit. The Machmeter is essentially an airspeed instrument that is calibrated in relation to Mach on the dial.