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.
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Merriam-Webster Online Dictionaryultrasound (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