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English definition of “ultrasound”

ultrasound

noun     /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 Medical and surgical equipment [C] an ultrasound scan Medical examination
(Definition of ultrasound noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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