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ul·tra·sound scan medicine medical exam using ultrasound: an examination of an internal body part, especially a fetus in the womb, using ultrasound technology.

Merriam-Webster Online Dictionary
ultrasound (noun)
vibrations of the same physical nature as sound but with frequencies above the range of human hearing
the diagnostic or therapeutic use of ultrasound and especially a noninvasive technique involving the formation of a two-dimensional image used for the examination and measurement of internal body structures and the detection of bodily abnormalities - called also sonography
a diagnostic examination using ultrasound
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