su·per·son·ic 
(s′pər-sŏnĭk)
(s′pər-sŏnĭk)adj.
1. Having, caused by, or relating to a speed greater than the speed of sound in a given medium, especially air.
2. Of or relating to sound waves with a frequency above the range audible to the human ear; ultrasonic.
su′per·soni·cal·ly adv.