Entry 2 senses · 2 variants Webster, 1913 Atrabilarian · At·ra·bi·la·ri·an · IPA /ˌætɹəbəˈlɛɹi.ən/ a. n. 01 a. Affected with melancholy; atrabilious. 1. Affected with melancholy; atrabilious. 02 n. A person much given to melancholy; a hypochondriac. 1. A person much given to melancholy; a hypochondriac.