Etymology
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Words related to ultrasonic

ultra- 

word-forming element meaning "beyond" (ultraviolet) or "extremely" (ultramodern), from Latin ultra- from ultra (adv. and prep.) "beyond, on the other side, on the farther side, past, over, across," from PIE *ol-tero-, suffixed form of root *al- "beyond." In common use from early 19c., it appears to have arisen from French political designations. As its own word, a noun meaning "extremist" of various stripes, it is first recorded 1817, from French ultra, shortening of ultra-royaliste "extreme royalist."

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sonic (adj.)

1923, from Latin sonus "sound" (from PIE root *swen- "to sound") + -ic. Sonic boom is attested from 1952.

supersonic (adj.)
1919, "of or having to do with sound waves beyond the limit of human hearing," from super- + sonic. Attested from 1934 in sense of "exceeding the speed of sound" (especially as a measure of aircraft speed), leaving the original sense to ultrasonic (1923).
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.