A m e r i c a' s   H e a l t h   S e a r c h   E n g i n e Pharmacology, and Medical Terminology Lookup

Definition of Thyroid hormone Thyroid hormone: A chemical substance made by the thyroid gland for export into the bloodstream. The thyroid gland needs iodine to make thyroid hormones. The two most important thyroid hormones are thyroxine T4 and triiodothyronine T3. The thyroid gland is located in front of the neck just in front of the trachea.

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