Crossword puzzle clue "airspeed ratio"

Here are the possible solutions for airspeed ratio clue

Answer
Clue
Relevancy
mach
Clue
Airspeed ratio
Airspeed measure
Airspeed number
Definition
a number relating the speed of a body to the speed of sound
machmeter
Clue
Airspeed ratio indicator
Definition
an instrument for measuring Mach number
eta
Clue
Hr. related to airspeed
Definition
a Greek letter
albedo
Clue
Light ratio in astronomy
Light reflection ratio
Astronomer's light ratio
Definition
(Latin) the measure of the reflecting power of an object

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