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1. Oxford American Dictionary

   ultrasonic

   • IPA[ˌəltrəˈsänik]

   美式

   • adj.
     of or involving sound waves with a frequency above the upper limit of human hearing.
2. • 相關詞

   ultrasonics

   • plural
     the science and application of ultrasonic waves.

   Oxford American Dictionary

   ultrasonics

   • plural
     the science and application of ultrasonic waves.

   Oxford Dictionary

3. • 更多解釋

   ultrasonic

   • IPA[ˌʌltrəˈsɒnɪk]

   英式

   • adj.
     of or involving sound waves with a frequency above the upper limit of human hearing.

   Oxford Dictionary