Entry 1 sense Webster, 1913 Doris /dôr'-əs/ · Do·ris · IPA /ˈdɔɹɪs/ 01 n. A genus of nudibranchiate mollusks having a wreath of branchiæ on the back. 1. A genus of nudibranchiate mollusks having a wreath of branchiæ on the back.(Zool.)