thyroxine

American  

[thahy-rok-seen, -sin] / θaɪˈrɒk sin, -sɪn /

Also thyroxin

noun

1. Biochemistry. the thyroid gland hormone that regulates the metabolic rate of the body.

2. Pharmacology. a commercial form of this compound, obtained from the thyroid glands of animals or synthesized, used in the treatment of hypothyroidism. T 4

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thyroxine British  

/ θaɪˈrɒksɪn, θaɪˈrɒksiːn, -sɪn /

noun

1. the principal hormone produced by the thyroid gland: it increases the metabolic rate of tissues and also controls growth, as in amphibian metamorphosis. It can be synthesized or extracted from the thyroid glands of animals and used to treat hypothyroidism. Chemical name: tetra-iodothyronine; formula: C 15 H 11 I 4 NO 4

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thyroxine Scientific  

/ thī-rŏk′sēn′,-sĭn /

1. An iodine-containing hormone secreted by the thyroid gland that increases the rate of cell metabolism and regulates growth. Thyroxine can also be made synthetically for treatment of hypothyroidism.

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Etymology

Origin of thyroxine

1915–20; thyr- ( def. ) + ox- + in(dol)e (originally thought to be a chemical component)

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

However, the OATP1C1 transporter protein used in the new study was found to be far more effective at transporting thyroxine derivatives than LAT1.

From Science Daily • Nov. 8, 2023

The baby lacks thyroxine, a key growth hormone.

From BBC • Dec. 7, 2022

Other lipid-soluble hormones that are not steroid hormones, such as vitamin D and thyroxine, have receptors located in the nucleus.

From Textbooks • Jun. 9, 2022

This is corroborated by a low thyroxine level of 0.6 micrograms percent, which is hypothyroid for wolves.

From An Experimental Translocation of the Eastern Timber Wolf by Hook, Richard A.