Entry 1 sense Webster, 1913 dermatologist /dẽrmˌ-ət-äl'-əj-ĭst/ · der·ma·tol·o·gist · IPA /ˌdɝ.məˈtɑ.lə.d͡ʒɪst/ 01 n. One who discourses on the skin and its diseases; one versed in dermatology 1. One who discourses on the skin and its diseases; one versed in dermatology