from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An aircraft instrument that indicates speed in Mach numbers.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An instrument that measures the speed of an aircraft relative to that of sound and displays it in Mach numbers
from the GNU version of the Collaborative International Dictionary of English
- n. an instrument for measuring the speed of an aircraft relative to the speed of sound.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. speedometer for measuring the speed of an aircraft relative to the speed of sound
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