TRIIODOTHYRONINE Definition & Meaning

triiodothyronine

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

Phonetic (Standard)IPA

noun

Biochemistry. a thyroid hormone, C 15 H 12 I 3 NO 4 , similar to thyroxine but several times more potent.
Pharmacology. a preparation of this hormone, used in treating hypothyroidism. : T 3

triiodothyronine

/ ˌ�ٰ��ɪ��ɪˌəʊ��əʊˈθ��ɪ��əˌ�Ծ�ː�� /

noun

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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�y��vlog History and Origins

Origin of triiodothyronine¹

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

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�y��vlog History and Origins

Origin of triiodothyronine¹

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

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Example Sentences

Examples have not been reviewed.

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

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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.

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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.

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

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

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