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Search "ultrasonic" in: ultrasonic
1
: having a frequency above the human ear's audibility limit of about 20,000 hertz —used of waves and vibrations
2
: utilizing, produced by, or relating to ultrasonic waves or vibrations <ultrasonic testing of metal>
— ul·tra·son·i·cal·ly
\-ni-k(ə-)lē\
adverb
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