Meaning of “ultrasound” - Learner’s Dictionary

ultrasound

noun uk us /ˈʌltrəsaʊnd/
SOUND WAVES [ U ]

very high sound waves, especially those that are used in medical examinations to produce an image of something inside your body:

an ultrasound scan
MEDICAL EXAMINATION [ C ]

a medical examination that produces an image of something that is inside the body, especially a baby, using sound waves:

An ultrasound revealed a perfectly healthy baby.

(Definition of “ultrasound” from the Cambridge Learner’s Dictionary © Cambridge University Press)