tomographyPronunciation: /təˈmɒgrəfi/Definition of tomography noun [mass noun] a technique for displaying a representation of a cross section through a human body or other solid object using X-rays or ultrasound. Derivatives tomographic adjective tomographically adverb Origin: 1930s: from Greek tomos 'slice, section' + -graphytomography in other Oxford dictionaries Definition of tomography in the US English dictionary