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Adjective: supersonic  ,soo-pu(r)'só-nik
  1. (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"
  2. Having frequencies above those of audible sound
    - ultrasonic

See also: inaudible, unhearable

Antonym: sonic, subsonic

Encyclopedia: Supersonic