Entry 2 senses · 2 variants Webster, 1913 Tartarous · Tar·tar·ous · IPA a. a. 01 a. Containing tartar; consisting of tartar, or partaking of its qualities; tartareous. 1. Containing tartar; consisting of tartar, or partaking of its qualities; tartareous. 02 a. Resembling, or characteristic of, a Tartar; ill-natured; irritable. 1. Resembling, or characteristic of, a Tartar; ill-natured; irritable. “The Tartarous moods of common men.” — B. Jonson.