machmeter

mach·me·ter

[mahk-mee-ter, mak-]
noun Aeronautics.
a device that indicates airspeed relative to the speed of sound.

Origin:
mach + -meter

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Collins
World English Dictionary
Machmeter (ˈmækˌmiːtə) [Click for IPA pronunciation guide]
 
n
an instrument for measuring the Mach number of an aircraft in flight

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Machmeter is always a great word to know.
So is bezoar. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
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