It's calculated relative to the speed of sound Crossword Clue
4 letters · New York Times · Friday, August 27, 2021 · 25-Down
Appeared in 1 New York Times Crossword: Friday, August 27, 2021.
Exact puzzle match · New York Times · August 27, 2021 · 25-Down · 4 letters
MACH0 of 4 letters revealed
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