thi·​a·​mine | \ ˈthī-ə-mən How to pronounce thiamine (audio) , -ˌmēn \
variants: or thiamin \ ˈthī-​ə-​mən How to pronounce thiamine (audio) \

Definition of thiamine

: a vitamin C12H17N4OSCl of the vitamin B complex that is essential to normal metabolism and nerve function and is widespread in plants and animals

called also vitamin B1

Examples of thiamine in a Sentence

Recent Examples on the Web Alewives carry high levels of an enzyme that triggers a thiamine deficiency in trout, which causes their eggs to either not hatch or induces deadly development problems in trout offspring., 2 Sep. 2021 The new research argues that an underlying cause of problems with the explorer’s heart and breathing was a thiamine deficiency. Livia Gershon, Smithsonian Magazine, 20 May 2021 The doctor ordered the missing minerals and admitted her to the hospital for a five-day course of high-dose thiamine replacement. New York Times, 3 Dec. 2020 Hoffman started the patient on intravenous thiamine even before the results of the testing came back. New York Times, 3 Dec. 2020 Some supplements may help relieve PMS bloating, such as vitamin E, vitamin D, thiamine, magnesium, or omega-3 fish oil, Dr. Ross adds. Samantha Lauriello,, 20 Nov. 2019 The B vitamins in whole grains, including thiamine, niacin and riboflavin, are crucial metabolism aids. Jenna Birch, Washington Post, 19 Aug. 2019 The Impossible Burger also beats beef in many vitamin and mineral categories, including folate, B12, thiamine and iron. Savannah Eadens, The Courier-Journal, 17 May 2017 Mushrooms are rich in B vitamins: riboflavin [B2], folate [B9], thiamine [B1], pantothenic acid [B5], and niacin [B3]. Lisa Mulcahy, Good Housekeeping, 3 June 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'thiamine.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of thiamine

1937, in the meaning defined above

History and Etymology for thiamine

thiamine alteration of thiamin, from thi- + -amin (as in vitamin)

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Time Traveler for thiamine

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The first known use of thiamine was in 1937

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Last Updated

16 Sep 2021

Cite this Entry

“Thiamine.” Dictionary, Merriam-Webster, Accessed 19 Sep. 2021.

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More Definitions for thiamine



English Language Learners Definition of thiamine

: a natural substance (called a vitamin) that is found in certain foods and that helps your body to be healthy


variants: also thiamin \ ˈthī-​ə-​mən \

Kids Definition of thiamine

: a type of vitamin B that is used by the body to convert carbohydrates into energy and to maintain normal nerve function


thi·​a·​mine | \ ˈthī-ə-mən, -ˌmēn How to pronounce thiamine (audio) \
variants: or thiamin \ -​mən How to pronounce thiamine (audio) \

Medical Definition of thiamine

: a vitamin C12H17N4OSCl of the vitamin B complex that is an amino hydroxy quaternary ammonium water-soluble salt containing a thiazole ring and a pyrimidine ring, that occurs widely both free (as in the germs of cereals and hulls of grain) and combined (as in yeast and in animal tissues like liver, kidneys, and heart) but is usually synthesized commercially, that functions in the body as a cocarboxylase and is essential for carbohydrate metabolism and for normal functioning of the nervous system, and that is used in nutrition (as in vitamin preparations and in enriching flour and bread) and in medicine

called also vitamin B1

More from Merriam-Webster on thiamine

Nglish: Translation of thiamine for Spanish Speakers Encyclopedia article about thiamine


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