| Answer | Crossword Clue |
|---|---|
| SONIC | Of a speed equal to the speed of sound. |
| mach | a number relating the speed of a body to the speed of sound |
| machs | MACH, a number relating the speed of a body to the speed of sound |
| mach | number indicating the ratio of the speed of an object to the speed of sound in the medium through which the object is moving |
| machs | number indicating the ratio of the speed of an object to the speed of sound in the medium through which the object is moving |
| supersonic | a wave or frequency moving at a speed greater than the speed of sound in air |
| supersonics | SUPERSONIC, a wave or frequency moving at a speed greater than the speed of sound in air |
