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Definition of Hormone, thyroid

Hormone, thyroid: Chemical substance made by the thyroid gland which is located in the front of the neck. The thyroid gland uses iodine to make thyroid hormones. The two most important thyroid hormones are thyroxine (T4) and triiodothyronine (T3).

Thyroid Gland illustration - Hormone, thyroid
Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=3799
Last Editorial Review: 8/28/2013

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