Definition of triiodothyronine in English:



mass nounBiochemistry
  • A thyroid hormone similar to thyroxine but having greater potency.

    • ‘Human beings require iodine for the production of the thyroid hormones, thyroxine and triiodothyronine.’
    • ‘The vertebrate thyroid gland produces two iodinated amino acids, thyroxine and triiodothyronine, which regulate diverse aspects of development, metabolic stimulation and metamorphosis.’
    • ‘Thyroid-function test findings might be consistent with the euthyroid sick syndrome, with low triiodothyronine and thyroxine levels and a normal thyroid-stimulating hormone level.’
    • ‘Subclinical thyroid dysfunction, with abnormal thyroid-stimulating hormone and normal free thyroxine and triiodothyronine levels, also is associated with cardiac changes.’
    • ‘The thyroid hormones thyroxine and triiodothyronine are iodinated amino acid derivatives formed by oxidative coupling of two iodinated tyrosine residues in the thyroid protein thyroglobulin.’