ultrasonic

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English

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Etymology

ultra- +‎ sonic

Pronunciation

Adjective

ultrasonic (comparative more ultrasonic, superlative most ultrasonic)

  1. (acoustics) Beyond (higher in frequency than) the range of sound perceptible to the human ear; with a frequency of 20 kilohertz or higher.
    • 1961 March, C. P. Boocock, “The organisation of Eastleigh Locomotive Works”, in Trains Illustrated, pages 159-160:
      The wheel shop also has equipment for ultrasonic testing of axles for flaws; and systematic checking of locomotive axles and crank pins is carried out as they pass through the shops.

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