triiodothyronine

American  

[trahy-ahy-oh-doh-thahy-ruh-neen, -ahy-od-oh-] / ˌtraɪ aɪˌoʊ doʊˈθaɪ rəˌnin, -aɪˌɒd oʊ- /

noun

1. Biochemistry. a thyroid hormone, C 15 H 12 I 3 NO 4 , similar to thyroxine but several times more potent.

2. Pharmacology. a preparation of this hormone, used in treating hypothyroidism. T 3

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triiodothyronine British  

/ ˌtraɪaɪˌəʊdəʊˈθaɪrəˌniːn /

noun

1. 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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Etymology

Origin of triiodothyronine

1950–55; tri- + iodo- + thyronine (perhaps derivative, with -one, of thyroxine )

Example Sentences

These include thyroid-stimulating hormone, or TSH, which stimulates the thyroid gland to release two other hormones: triiodothyronine, or T3, and thyroxine, or T4.

From Salon • Feb. 7, 2024

The thyroid is made up of follicle cells that produce the hormones thyroxine and triiodothyronine.

From Textbooks • Jun. 9, 2022

The thyroid produces the hormones thyroxine and triiodothyronine.

From Textbooks • Apr. 25, 2013

The thyroid follicle cells synthesize the hormone thyroxine, which is also known as T4 because it contains four atoms of iodine, and triiodothyronine, also known as T3 because it contains three atoms of iodine.

From Textbooks • Apr. 25, 2013

Noting that patients with overactive thyroids seemed to suffer less radiation injury, they tried a synthetic thyroid hormone product, triiodothyronine.

From Time Magazine Archive