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Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones. Alternative names for thyroxine T4; tetraiodothyronine; thyroxin.
thyroxine, thyroxin. a hormone of the thyroid gland that contains iodine and is a derivative of the amino acid tyrosine. The chemical name for thyroxine is tetraiodothyronine (symbol, T 4); it is formed and stored in the thyroid follicles as thyroglobulin, the storage form.Thyroxine is released from the gland by the action of a proteolytic enzyme.hyroxine, thyroxin. a hormone of the thyroid gland that contains iodine and is a derivative of the amino acid tyrosine. The chemical name for thyroxine is tetraiodothyronine (symbol, T 4); it is formed and stored in the thyroid follicles as thyroglobulin, the storage form.