There are 3 solutions. The longest is SOUND BARRIER with 12 letters, and the shortest is PHILOSOPHER with 11 letters.
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No, "MACH" hasn´t seen a spike right now. Solvers are most interested in: Forthright, Wild party, Fondness, Lose one's cool and Signal.
Solutions are between 11 and 12 letters long.
| Clue | Answer |
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| Speed unit (4) | |
| Eponymous physicist Ernst __ (4) | |
| Speed-of-sound ratio (4) | |
| Speed-of-sound word (4) | |
| Speed of sound measure (4) | |