ultrasoundnoun
uk/ˈʌl.trə.saʊnd/us/ˈʌl.trə.saʊnd/[ U ] special sound waves used in such processes as examining organs inside the body and directing the route of submarines:
They'll use ultrasound to monitor her ovaries.
ultrasound scanning/imaging
[ C ] an ultrasound scan
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Medical & surgical equipment
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Medical examination