OBJECTIVE: This study adapted the Definition-based Naming Test (DDQ-30) into Turkish (DDQ-30 TR) and assessed its psychometric properties. METHOD: The adaptation process included translation, cultural and linguistic modifications, expert review, and pilot testing. Normative data were collected from 357 cognitively healthy Turkish adults aged 50-79. Known-group discriminant validity was examined in 150 participants, including healthy controls (n = 50), individuals with mild cognitive impairment (MCI; n = 60), and Alzheimer's disease (ad; n = 40). RESULTS: DDQ-30 TR performance declined with age and improved with education. Norms were stratified by age, education, and sex. The test showed strong group validity (HC > MCI > ad) and acceptable reliability (α = 0.758). CONCLUSIONS: The DDQ-30 TR is a reliable, culturally adapted auditory naming tool that enables lexical-semantic assessment in Turkish-speaking older adults, particularly those with visual limitations. The DDQ-30 TR can be used as a supportive instrument within broader clinical screening protocols for neurocognitive disorders, especially among individuals with visual limitations.