tri·i·o·do·thy·ro·nine

(trī′ī-ō′dō-thī′rə-nēn′, -ī-ŏd′ō-)

n. Abbr. T₃

An iodine-containing hormone, C₁₅H₁₂I₃NO₄, produced by the thyroid gland and similar to but more potent than thyroxine. A synthetic form (liothyronine) is used in the treatment of hypothyroidism.

[tri- + iodo- + thyronine, an amino acid (thyr(o)- + -on(e) + -ine).]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

triiodothyronine

(ˌtraɪaɪˌəʊdəʊˈθaɪrəˌniːn)

(Biochemistry) an amino acid hormone that contains iodine and is secreted by the thyroid gland with thyroxine, to which it has a similar action. Formula: C15H12I3NO4

[C20: from tri- + iodo- + thyro- + -ine²]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

tri•i•o•do•thy•ro•nine

(ˌtraɪ aɪˌoʊ doʊˈθaɪ rəˌnin, -aɪˌɒd oʊ-)

n.

a thyroid hormone, C₁₅H₁₂I₃NO₄, similar to thyroxine but more potent: preparations of it used in treating hypothyroidism.

[1950–55; tri- + iod(ine) + -o- + thyronine (perhaps derivative, with -one, of thyroxine)]

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun

triiodothyronine - thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer

liothyronine, T

thyroid hormone - any of several closely related compounds that are produced by the thyroid gland and are active metabolically

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References in periodicals archive

Also, thyroidectomized patients naturally lose T3 that is synthesized from thyroid tissue though in small concentrations, and this may be one of the factors that contribute to patients' complaints, but the trials of combination therapy with L-thyroxine and triiodothyronine in these patients have not been conclusive so far (11).

Clinical Effects of Fine-Tuning: Thyroid Hormone Replacement

In healthy individuals, the thyroid gland, located in the neck, is responsible for regulating the metabolism by way of the hormones thyroxine and triiodothyronine. (1) Normally, the hypothalamus gland, located in the brain, secretes a thyroid-releasing hormone that signals the pituitary gland, aka the master gland, to secrete thyroid-stimulating hormone (TSH), which then signals the thyroid to produce thyroxine and triiodothyronine.

HYPERTHYROIDSM & HYPOTHYROIDSM: Know the signs

Measuring the levels of hormones produced by the thyroid, triiodothyronine (T3) and thyroxine (T4), can also provide information about your thyroid health.

Don't Overlook Symptoms of Thyroid Disease: Changes in weight, appetite, energy level, and bowel habits are some of the many signs of abnormal thyroid function

Laboratory results indicated elevated thyroid-stimulating hormone, normal levels of free triiodothyronine and free thyroxine, and a carcinoembryonic antigen level of 3.07 ng/ml.

Lung Metastasis of Thyroid Cancer Appearing Diffuse and Disseminated on Imaging

Euthyroid sick syndrome (ESS), also known as non-thyroidal illness syndrome or low triiodothyronine (T3) syndrome, is characterized by alterations in the levels of thyroid hormones due to non-thyroidal diseases in the absence of any disorder related to the hypothalamic-hypophysial axis or thyroid gland (1,2).

Prevalence and Related Factors of Euthyroid Sick Syndrome in Children with Untreated Cancer According to Two Different Criteria

The serum free triiodothyronine (fT3) and free thyroxine (fT4) levels were measured using a competitive enzyme immunoassay.

Relationship between Thyroid Volume and Baseline Vitamin D Levels in New-Onset Graves Disease

Objective: To determine the levels of serum thyroxine (T3,T4), triiodothyronine and thyrotropin in patients with acute myocardial infarction (AMI).

Levels of serum thyroxine, triidothyronine and thyrotropin in patients with acute myocardial infarction

7, 2018 (HealthDay News) -- Higher free triiodothyronine (fT3) levels, but not free thyroxine (fT4) or thyroid-stimulating hormone (TSH) levels, are associated with gestational diabetes mellitus (GDM), according to a study published in the July 1 issue of the Journal of Clinical Endocrinology & Metabolism.

Thyroid Dysfunction Linked to Gestational Diabetes; fT3 and fT3-to-fT4 ratio correlated positively with gestational diabetes at the first and second trimester

Anti-thyroid peroxidase (TPO), located at the apical membrane of the thyrocyte, is essential for thyroid hormone synthesis, catalysis of iodine oxidation, iodination of tyrosine residues in Tg (Thyroglobulin) and coupling of the iodothyrosines into thyroxine (T4) and triiodothyronine (T3).

Hashimoto's Thyroiditis

The thyroid is a butterfly-shaped gland in your neck that makes two hormones - thyroxine and triiodothyronine - that are secreted into the blood.

Thyroid problems; EVERYTHING YOU NEED TO KNOW ABOUT; Overactive, underactive or normal, what does it do and how can we deal with the problems it causes

The thyroid is a butterfly-shaped gland in your neck that makes two hormones -- thyroxine and triiodothyronine -- that are secreted into the blood.

Everything you need to know about thyroid problems and how to deal with them; Overactive, underactive or normal, what does it do and how can we deal with the problems it causes