ul·tra·so·nog·ra·phy 
(ŭl′trə-sə-nŏgrə-fē)
(ŭl′trə-sə-nŏgrə-fē)n.
The use of high-frequency sound waves to image internal body structures, a developing fetus, or objects and currents that are underwater. Also called echography.
ul′tra·so·nogra·pher n.
ul′tra·son′o·graphic (-sŏn′ə-grăfĭk, -sō′nə-) adj.