ultrasonic
adj. C1 Advanced US //ˌəɫtɹəˈsɑnɪk// UK //ˌʊltɹɐsˈɒnɪk// ul·tra·son·ic
adj. describing sound waves that are too high for humans to hear. You often hear about this in medicine or when talking about how animals like bats communicate.
adj. relating to sound waves with a frequency above the upper limit of human hearing, typically exceeding 20 kilohertz. Often describes diagnostic imaging or industrial cleaning processes.
The doctor uses an ultrasonic scanner to see the baby.
Bats navigate through the dark forest by emitting ultrasonic pulses and listening for the echoes.
Engineers employed ultrasonic testing to detect microscopic cracks in the aircraft's fuselage that were invisible to the naked eye.
From ultra- + sonic.
Usage
Typically used attributively before a noun.