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Lengua inglesa
ultrasound
noun sound consisting of waves with frequencies higher than 20,000Hz, and therefore above the upper limit of normal human hearing. It is widely used in medical diagnosis (especially during pregnancy when X-rays would be damaging), in sonar systems, for cleaning industrial tools, and for detecting flaws and impurities in metals.
[1920s]
noun sound consisting of waves with frequencies higher than 20,000Hz, and therefore above the upper limit of normal human hearing. It is widely used in medical diagnosis (especially during pregnancy when X-rays would be damaging), in sonar systems, for cleaning industrial tools, and for detecting flaws and impurities in metals.
[1920s]
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