Etymology
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ultrasound (adj.)

1911, from ultra- "beyond" + sound (n.1). Compare ultrasonic. In reference to ultrasonic techniques of detection or diagnosis it is recorded from 1958.

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Definitions of ultrasound

ultrasound (n.)
very high frequency sound; used in ultrasonography;
ultrasound (n.)
using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to observe fetal growth or study bodily organs;
Synonyms: sonography / ultrasonography / echography
From wordnet.princeton.edu