Medical Definition of thyroid hormone
: any of several closely related metabolically active compounds (as triiodothyronine) that are stored in the thyroid gland in the form of thyroglobulin or circulate in the blood usually bound to plasma proteins
especially
: thyroxine
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“Thyroid hormone.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/thyroid%20hormone. Accessed 17 Aug. 2022.
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