ultrasound
UK: ˈʌl.trə.saʊnd | US: ˈʌl.trə.saʊnd
n. sound waves with frequencies above the upper limit of human hearing, used in medical imaging and other applications
n. (medical) a diagnostic imaging technique using such waves to visualize internal body structures
ultrasound = ultra<beyond> + sound<auditory vibration>
- ultra: From Latin ultra ("beyond"), originally from ulter ("distant"). In modern usage, it denotes extremity or surpassing limits (e.g., ultraviolet, ultramodern).
- sound: From Old English sund ("swimming, sea"), later merging with Old French son ("sound") and Latin sonus ("noise"). Retains its core meaning of audible vibrations.
Etymology Origin:
Coined in the early 20th century by combining ultra- (beyond) + sound to describe frequencies exceeding human hearing (~20 kHz). The term reflects technological advancement, as such waves were harnessed for medical imaging post-World War II, evolving from naval sonar systems.
The doctor used ultrasound to monitor the baby’s development during pregnancy.
Bats navigate by emitting ultrasound and interpreting the echoes.
Ultrasound technology revolutionized non-invasive diagnostics.
The physicist studied how ultrasound interacts with soft tissues.
Veterinarians often employ ultrasound to examine animal organs.