- noun sound in the range of 20 000 Hz which cannot be heard by the human ear
- Any sound or vibration which occurs at ultrasonic frequencies. Also called ultrasonic sound.
- The utilization of ultrasonic waves for medical diagnostic or therapeutic purposes. Used, for instance, in ultrasonography, or for ultrasonic therapy.
- synonymultrasonic sound
- noun very high frequency sound waves which can be reflected off internal body parts or off a fetus in the womb to create images for medical examination