supersonic

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Adjective supersonic has 2 senses

supersonic - (of speed) greater than the speed of sound in a given medium (especially air); "a supersonic bomber flies so fast that it must release its bombs while the target is still over the horizon"
Antonyms: sonic, transonic, subsonic
supersonic, ultrasonic - having frequencies above those of audible sound
Antonyms: audible, hearable (indirect, via inaudible)

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