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ultranationalism
ultrashort
ultrasonic
ultrasonic testing
ultrasonic welding
ultrasonics
ultrasonogram
ultrasonography
ultrasound
ultrastructure
ultraviolet
ultraviolet astronomy
ultraviolet-visible spectroscopy
ultravirus
ulu
ululate
Uluru
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ultrasound

ul·tra·sound [ últrə sòwnd ] (plural ul·tra·sounds)


noun 
Definition:
 
1. high-frequency sound: sound of a frequency above the upper limit of the normal range of human hearing, which is about 20 kilohertz

2. sound waves used in medicine: a technique that uses high-frequency sound waves for medical diagnosis and treatment, e.g. to create images of internal organs, to treat deep tissue disorders, and to break up kidney stones

3. 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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