thi·​a·​mine ˈthī-ə-mən How to pronounce thiamine (audio)
variants or thiamin
: 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 In response, officials have been treating water in hatcheries and injecting thiamine into salmon eggs to help fish survive. Ian James, Los Angeles Times, 31 Mar. 2024 Alcohol hinders the absorption of thiamine and interferes with the enzyme that converts it into a usable form in the body.19 Alcohol and Memory Loss Alcohol has short- and long-term effects on your memory. Amanda MacMillan, Health, 26 Mar. 2024 Kombucha contains vitamins B6, B12, riboflavin, thiamine and niacin! Jenna Thompson, Kansas City Star, 27 Feb. 2024 Active ingredients: Chamomile, ginger, thiamine, passionflower, L-tryptophan, and melatonin 20. Amber Smith, Discover Magazine, 23 Oct. 2022 The disease, which is caused by a deficiency of vitamin B1, also known as thiamine, is preventable and reversible. Los Angeles Times, 7 Nov. 2023 Hinkle also modified the recipe to incorporate vitamin B1 in the form of thiamine hydrochloride—useful in tropical climates, where troops might be susceptible to vitamin deficiencies and associated diseases, like beriberi. Kovie Biakolo, Smithsonian Magazine, 25 Oct. 2023 Some contract beriberi, a disease caused by deficiencies in vitamin B1, also known as thiamine, and often induced by diets consisting mainly of foods such as white rice or instant noodles, which are low in this vitamin. Ian Urbina, TIME, 26 Oct. 2023 There are a series of vitamins found in eggs, including vitamins A, B12, D, E, biotin, riboflavin and thiamine. Olivia Munson, USA TODAY, 30 Aug. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'thiamine.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


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

First Known Use

1937, in the meaning defined above

Time Traveler
The first known use of thiamine was in 1937

Dictionary Entries Near thiamine

Cite this Entry

“Thiamine.” Dictionary, Merriam-Webster, Accessed 12 Apr. 2024.

Kids Definition


thi·​a·​mine ˈthī-ə-ˌmən How to pronounce thiamine (audio)
variants also thiamin
: a vitamin of the B complex that is necessary for normal metabolism and nerve function and is found in many plants and animals

called also vitamin B1

Medical Definition


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

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