noun

ultrasound

ultrasound, ultrasound scan

The doctor ordered an ultrasound.

The doctor ordered an ultrasound.

Bats use ultrasound to navigate.

Bats use ultrasound to navigate.

an ultrasound a medical test using sound waves She had an ultrasound to check the baby.

Synonyms: sonogram, echography (for the scan)

From 'ultra-' (beyond) + 'sound'. It refers to sound waves beyond the range of human hearing.

'Ultra' means 'beyond' normal. So, 'ultrasound' is sound that is 'beyond' what humans can hear.

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