adjective🔗ShareUltraschall-(acoustics) Beyond (higher in frequency than) the range of sound perceptible to the human ear; with a frequency of 20 kilohertz or higher."The dog whistle emits an ultrasonic sound that humans can't hear, but dogs can. "Die Hundepfeife sendet einen Ultraschallton aus, den Menschen nicht hören können, Hunde aber schon.soundphysicsfrequencytechnologyscienceelectronicsChat with AIVocabulary GamePractice Reading
