triiodothyronine

[ trahy-ahy-oh-doh-thahy-ruh-neen, -ahy-od-oh- ]

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

triiodothyronine

/ 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

Word History and Origins

Origin of triiodothyronine¹

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

Word History and Origins

Origin of triiodothyronine¹

C20: from tri- + iodo- + thyro- + -ine ²

Example Sentences

The ratio of thyroxine to triiodothyronine in humans is about 80:201.

From Nature

Homesickness, cabin fever and something called polar T3 syndrome — a drop in the level of the thyroid hormone triiodothyronine, causing forgetfulness and other cognitive impairments — make a career in Antarctica a difficult choice for most.

From Washington Post

It remains to be seen whether triiodothyronine was not observed in the current study because of the experimental conditions or because of the sensitivity of the assay used.

From Nature

MIT then reacts with DIT to form triiodothyronine, or two DITs react to produce thyroxine, still bound to thyroglobulin.

From Nature

Thyroglobulin is then digested in organelles called lysosomes, producing free triiodothyronine and thyroxine, which are finally released into the bloodstream.

From Nature