ultrasonic
/ˌʌltrəˈsɑnɪk/
adjective
- Relating to sound waves with frequencies higher than the upper limit of human hearing (above about 20,000 hertz).
- Ultrasonic cleaners use high-frequency sound waves to remove dirt from jewelry.
- Some pest repellents emit ultrasonic sounds that humans cannot hear.
- Doctors use ultrasonic imaging to see inside the body without surgery.