iridology Syllabification: (ir·i·dol·o·gy)Pronunciation: /ˌiriˈdäləjē/Definition of iridology noun (in alternative medicine) diagnosis by examination of the iris of the eye. Derivatives iridologistPronunciation: /-jist/ noun Origin: early 20th century: from Greek iris, irid- 'iris' + -logyiridology in other Oxford dictionaries Definition of iridology in the British & World English dictionary