supersonic

Having, caused by, or relating to a speed greater than the speed of sound in a given medium, especially air.

Of or relating to sound waves beyond human audibility.

Moving at a speed greater than the speed of sound in air; — this speed varies with altitude, since the speed of sound varies with altitude, as well as with temperature and humidity, being approximately 1129 feet per second at sea level and 984 feet per second at 16 miles altitude.

Capable of moving at speeds higher than the speed of sound; — of aircraft.

ultrasonic, having a frequency too high to be audible

greater than the speed of sound (in the same medium, and at the same temperature and pressure)

having frequencies above those of audible sound

(of speed) greater than the speed of sound in a given medium (especially air)