Entry 1 sense Webster, 1913 Adriatic /ādˌ-rē-ăt'-ĭk/ · A·dri·at·ic · IPA /ˌeɪ.dɹiˈæt.ɪk/ 01 a. Of or pertaining to a sea so named, the northwestern part of which is known as the Gulf of Venice. 1. Of or pertaining to a sea so named, the northwestern part of which is known as the Gulf of Venice.