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

See also: inaudible, unhearable

Antonym: sonic, subsonic

Encyclopedia: Supersonic