au·to·ra·di·o·graph (ô'tō-rā'dē-ō-grāf') n. An image recorded on a photographic film or plate produced by the radiation emitted from a specimen, such as a section of tissue, that has been treated or injected with a radioactively labeled isotope or that has absorbed or ingested such an isotope. Also called autoradiogram. au'to·ra'di·o·graph'ic adj., au'to·ra'di·og'ra·phy (-ŏg'rə-fē) n.