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ultrasound

noun
 
 
/ˈʌl.trə.saʊnd/

Definition

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