sound of too high a frequency to be perceived by humans; = ultrasound, n.; (also) sound of an intensity above the threshold of pain.
| 单词 | θ65530 |
| 释义 | the world > physical sensation > hearing and noise > thing heard > [noun] > sound > supersound or ultrasound (3) supersound1920 sound of too high a frequency to be perceived by humans; = ultrasound, n.; (also) sound of an intensity above the threshold of pain. ultrasound1923 Sound waves or vibrations with frequencies greater than those audible to the human ear, or greater than 20,000 Hz; also, ultrasonic techniques. ultrasonics1924 With plural agreement. Ultrasonic waves; ultrasound. |
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