ultrasound
🇺🇸
/ˈʌltrəsaʊnd/
🇬🇧
/ˈʌltrəsaʊnd/
A sound with a frequency higher than the upper audible limit of human hearing.
Dolphins use ultrasound to communicate underwater.
A medical imaging technique that uses high-frequency sound waves to create images of the inside of the body.
The doctor used an ultrasound to check the baby's development in the womb.