iridologyPronunciation: /ˌʌɪrɪˈdɒlədʒi, ˌɪrɪ-/Definition of iridology noun [mass noun] (in alternative medicine) diagnosis by examination of the iris of the eye. Derivatives iridologist noun Origin: early 20th century: from Greek iris, irid- 'iris' + -logyiridology in other Oxford dictionaries Definition of iridology in the US English dictionary