ultrasound
/ˈʌltrəsaʊnd/noun
mass noun
1- sound or other vibrations having an ultrasonic frequency, particularly as used in medical imaging超声; 超声波。
1.1
- count noun an ultrasound scan, especially one of a pregnant woman to examine the fetus（尤指对孕妇胎儿检查）超声波扫描。