<p><strong>Adjective:</strong></p><ul><li>of or relating to the thyroid gland.</li><li>of or relating to the largest cartilage of the larynx, forming the projection known in humans as the Adam's apple.</li></ul><p><strong>Noun:</strong></p><ul><li>thyroid gland.</li><li>the thyroid cartilage.</li><li>an artery, vein, etc., in the thyroid region.</li><li>Medicine/Medical: a preparation made from the thyroid glands of certain animals, used in treating hypothyroid conditions.</li></ul>