ultrasoundn.
/ˈʌltrəsaʊnd/, U.S. /ˈəltrəˌsaʊnd/ Sound waves or vibrations with frequencies greater than those audible to the human ear, or greater than 20,000 Hz; also, ultrasonic techniques.
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the world > physical sensation > hearing and noise > thing heard > [noun] > sound > supersound or ultrasound
supersound1920
ultrasound1923
ultrasonics1924
the world > matter > physics > science of sound > vibration > [noun] > above human range
ultrasound1923
ultrasonics1924
1923 Proc. & Trans. Royal Soc. Canada 17 iii. 143 When the electrical exciting sources were alternating in potential, the tonic trains of ultra-sound so produced—120 pulses per second—could be heard in the stethoscope.
1936 Jrnl. Royal Aeronaut. Soc. 40 25 Ultra-sound waves are generated by a quartz oscillator arc propagated through a surrounding liquid medium.
1953 J. Y. Cousteau Silent World 104 Are porpoises equipped with sonic or ultra-sound apparatus by which their squeaks give them the feel of unseen bottom topography?
1958 Oxf. Mail 30 June 4/4 Some firms now use ultrasound to detect flaws in metal.
1968 New Scientist 16 May 347/1 The moth's sensitivity to ultrasound may have other uses.
1984 Times 16 Nov. 12/4 Any woman who is worried about malformations would be subject to a detailed ultrasound scan.
This entry has not yet been fully updated (first published 1986; most recently modified version published online March 2022).
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n.1923