ultrasonic waves at frequencies above the audible range (above about 20 kHz), used in cleaning metallic parts, echo sounding, medical diagnosis and therapy, etc
WordReference Random House Learner's Dictionary of American English © 2025
ul•tra•sound /ˈʌltrəˌsaʊnd/USA pronunciation
n. [uncountable]
WordReference Random House Unabridged Dictionary of American English © 2025- Physicssound with a frequency greater than 20,000 Hz, close to the upper limit of human hearing.
- Medicinethe application of ultrasonic waves to methods of diagnois or of healing, as in deep-heat treatment of a joint.
ul•tra•sound
(ul′trə sound′),USA pronunciation n.
- Physicssound with a frequency greater than 20,000 Hz, approximately the upper limit of human hearing.
- Medicinethe application of ultrasonic waves to therapy or diagnostics, as in deep-heat treatment of a joint or imaging of internal structures. Cf. ultrasonography.
- ultra- + sound1 1920–25
Collins Concise English Dictionary © HarperCollins Publishers::
'ultrasound' also found in these entries (note: many are not synonyms or translations):
echocardiography
- echography
- lithotripsy
- lithotripter
- saser
- scan
- scanner
- sonogram
- sonoluminescence
- transvaginal
- ultra
- ultrasonic
- ultrasound scanner