Entry 1 sense Webster, 1913 Sternothyroid · Ster·no·thy·roid · IPA /ˌstɝ.noʊˈθaɪˌɹɔɪd/ 01 a. Of or pertaining to the sternum and the thyroid cartilage. 1. Of or pertaining to the sternum and the thyroid cartilage.(Anat.)