ultrasonography Syllabification: (ul·tra·so·nog·ra·phy)Pronunciation: /ˌəltrəsəˈnägrəfē/Definition of ultrasonography noun Medicine a technique using echoes of ultrasound pulses to delineate objects or areas of different density in the body. Derivatives ultrasonographicPronunciation: /əltrəˌsänəˈgrafik, -ˌsōnə-/ adjective ultrasonography in other Oxford dictionaries Definition of ultrasonography in the British & World English dictionary