Crossword puzzle clue "flying speed ratio"

Here are the possible solutions for flying speed ratio clue

Answer
Clue
Relevancy
mach
Clue
Flying speed ratio
Speed-of-sound ratio
Speed ratio
Speed-ratio number
Speed of sound ratio
Sound-speed ratio number
Physicist for whom a speed-of-sound ratio is named
-- number (speed ratio)
Definition
a number relating the speed of a body to the speed of sound

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