sternothyroid /ˌstɝ.noʊˈθaɪˌɹɔɪd/adjective 2noun 1forms 1 adjective2 •Relating to the sternum and the thyroid cartilage. •Of or pertaining to the sternothyroid muscle. noun1 •Ellipsis of sternothyroid muscle. formssternothyroids