Entry 1 sense Webster, 1913 epidemiologist /ĕpˌ-əd-ēmˌ-ēˌ-äl'-əj-ĭstˌ/ · ep·i·de·mi·ol·o·gist · IPA /ˌɛpədˌiːmˌiːˈɑlədʒˌɪst/ 01 n. A person skilled in epidemiology. 1. A person skilled in epidemiology.