I. -ˈsä-nik adjective
Etymology: Latin super- + sonus sound — more at sound
Date: 1919
1. : ultrasonic
2. : of, being, or relating to speeds from one to five times the speed of sound in air — compare sonic
3. : moving, capable of moving, or utilizing air currents moving at supersonic speed
4. : relating to supersonic airplanes or missiles
the supersonic age
• su·per·son·i·cal·ly -ni-k(ə-)lē adverb
II. noun
Date: circa 1924
1. : a supersonic wave or frequency
2. : a supersonic airplane