Entry 1 sense Webster, 1913 Humerus /hyo͞o'mərəs/ · Hu·me·rus · IPA /ˈhjuːməɹəs/ 01 n. The bone of the brachium, or upper part of the arm or fore limb. pl. Humeri ((#)) 1. The bone of the brachium, or upper part of the arm or fore limb.(Anat.)