- a thyroid hormone, C15H12I3NO4, similar to thyroxine but several times more potent.
- a preparation of this hormone, used in treating hypothyroidism. Abbreviation: T3
- an amino acid hormone that contains iodine and is secreted by the thyroid gland with thyroxine, to which it has a similar action. Formula: C 15 H 12 I 3 NO 4
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