thyroid /ˈθaɪ.ɹɔɪd/adjective 4noun 3forms 1 adjective4 •Of, relating to, or being the thyroid gland. •Suggestive of a disordered thyroid gland. •Of, relating to, or being the thyroid cartilage. •Shield-shaped; peltiform. noun3 •An extract prepared from the thyroid gland of animals and used in treating deficiency of thyroid hormones. •Ellipsis of thyroid gland. •Ellipsis of thyroid cartilage. formsthyroids