Entry 1 sense Webster, 1913 Dermatology /dẽrmˌ-ət-äl'-əj-ē/ · Der·ma·tol·o·gy · IPA /ˌdɜːməˈtɒlədʒi/ 01 n. The science which treats of the skin, its structure, functions, and diseases. 1. The science which treats of the skin, its structure, functions, and diseases.