Sound waves or vibrations with frequencies greater than those audible to the human ear, or greater than 20,000 Hz; also, ultrasonic techniques.
| 单词 | θ76762 |
| 释义 | the world > matter > physics > science of sound > vibration > [noun] > above human range (4) 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. Subcategories:— science of (2) |
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