Definitions for machmeter
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Princeton's WordNet
machmeter(noun)
speedometer for measuring the speed of an aircraft relative to the speed of sound
Wiktionary
Machmeter(Noun)
An instrument that measures the speed of an aircraft relative to that of sound and displays it in Mach numbers
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"machmeter." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/machmeter>.

