What is an antonym for ultrasound?
Possible antonyms include infrasound.
(physics) Sound with a frequency greater than the upper limit of human hearing, which is approximately 20 kilohertz.
Common opposites include infrasound.
Related dictionary entries include ultrasonic, imaging, sonar, echo, resonance, sonogram.
A related word is not always a direct replacement. Compare its definition, grammar, tone, and sentence context first.
Possible antonyms include infrasound.
Relationships are shown only after the shared lexical validator accepts them. A suggestion is not automatically an exact replacement.