ultrasonographyPronunciation: /ˌʌltrəsəˈnɒgrəfi/Definition of ultrasonography noun [mass noun] Medicine a technique using echoes of ultrasound pulses to delineate objects or areas of different density in the body. Derivatives ultrasonographicPronunciation: /ˌʌltrəsɒnəʊˈɣrafɪk/ adjective ultrasonography in other Oxford dictionaries Definition of ultrasonography in the US English dictionary