magic eyeEnglishOxford New American Dictionarymagic eye /ˌmajik ˈī, ˌmædʒɪk ˈaɪ / ▸ noun 1 informal a photoelectric cell or similar electrical device used for identification, detection, or measurement. 2 a small cathode ray tube in some radio receivers that displays a pattern which enables the radio to be accurately tuned.