Meaning : (of speed) greater than the speed of sound in a given medium (especially air).
Example :
A supersonic bomber flies so fast that it must release its bombs while the target is still over the horizon.
Meaning : Having frequencies above those of audible sound.
Example :
Sound frequency above 20 kilohertz (20kHz) is called ultrasonic.
Humans can't hear ultrasonic sounds.
Synonyms : ultrasonic