Speed-of-sound ratio
The crossword clue "Speed-of-sound ratio" is answered by MACH, a 4-letter entry. Used 17 times across 13 distinct years; most recently in 2026; first recorded in 2000. It appears in 8 publications in the xd corpus. Every figure on this page comes from the collection data itself, never from a guess.
The answer
MACH
4 letters. See every clue for this answer on the MACH answer page.
Used 17 times across 13 distinct years; most recently in 2026; first recorded in 2000. It appears in 8 publications in the xd corpus. Frequency and last-seen figures come from the xd crossword corpus only.
Other clues for MACH
Every other clue in this collection answered by MACH, most used first.
- Speed-of-sound word - used 25 times, most recently in 2025
- ___ 1 (speed of sound) - used 21 times, most recently in 2026
- Jet speed measure - used 19 times, most recently in 2026
- Speed ratio - used 17 times, most recently in 2021
- Physicist Ernst - used 11 times, most recently in 2025
- Speed-of-sound number - used 10 times, most recently in 2026
- Supersonic unit - used 9 times, most recently in 2024
- Austrian physicist. - used 8 times, most recently in 2013
- Jet speed unit - used 8 times, most recently in 2014
- Supersonic speed unit - used 8 times, most recently in 2025
- Airspeed ratio - used 6 times, most recently in 2026
- Eponymous physicist Ernst - used 6 times, most recently in 2021
Related clues
Clues in this collection of the same answer length that share a word with this clue, or match its answer pattern when no word is shared. Most used first.
- Canyon sound - ECHO, used 202 times
- Throat-clearing sound - AHEM, used 180 times
- Scissors sound - SNIP, used 135 times
- High-five sound - SLAP, used 132 times
- Horn sound - TOOT, used 132 times
- Attention-getting sound - PSST, used 120 times
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