ophthalmologist UK /ˌɒf.θælˈmɒ.lə.d͡ʒɪst/US /ˌɔf.θə(l)ˈmɑ.lə.d͡ʒɪst/ noun1 •A medical doctor specializing in the eye: deficiencies of vision requiring correction, and diseases. Compare optometrist. formsophthalmologists