This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

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

adj. Of or relating to sound waves beyond human audibility.

adj. ultrasonic, having a frequency too high to be audible

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

adj. 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.

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

adj. having frequencies above those of audible sound

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

"It is then repeated several times, and I realise what we are hearing is not rockets, but planes - very loud and incredibly fast, making me think of the term supersonic, if that even means anything outside of comics."

inaudible    unhearable   

superluminal   

subsonic    infrasonic    plasmasonic    hypersonic    transonic   

Ionic    Masonic    Miltonic    Napoleonic    Panasonic   

twin-engine    hypersonic    low-flying    single-engine    subsonic