American Heritage® Dictionary of the English Language, Fourth Edition
- n. An aircraft instrument that indicates speed in Mach numbers.
- n. An instrument that measures the speed of an aircraft relative to that of sound and displays it in Mach numbers
GNU Webster's 1913
- n. an instrument for measuring the speed of an aircraft relative to the speed of sound.
- n. speedometer for measuring the speed of an aircraft relative to the speed of sound
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