[ thahy-uh-min, -meen ]

  1. a white, crystalline, water-soluble compound of the vitamin-B complex, containing a thiazole and a pyrimidine group, C12H17ClN4OS, essential for normal functioning of the nervous system, a deficiency of which results chiefly in beriberi and other nerve disorders: occurring in many natural sources, as green peas, liver, and especially the seed coats of cereal grains, the commercial product of which is chiefly synthesized in the form of its chloride salt (thiamine hydrochloride ) for therapeutic administration, or in nitrate form (thiamine mononitrate ) for enriching flour mixes.

Origin of thiamine

First recorded in 1905–10; thi- + amine
  • Also thi·a·min [thahy-uh-min]. /ˈθaɪ ə mɪn/.

Words Nearby thiamine Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use thiamine in a sentence

  • Like a hard drive that keeps a computer running, this network helps the body synthesize and process key nutrients like thiamine, a B vitamin made by intestinal bacteria that fuels brain function.

    How Grief Upsets Your Gut Health | Juli Fraga | July 1, 2022 | Time

British Dictionary definitions for thiamine


thiamin (ˈθaɪəmɪn)

/ (ˈθaɪəˌmiːn, -mɪn) /

  1. biochem a soluble white crystalline vitamin that occurs in the outer coat of rice and other grains. It forms part of the vitamin B complex and is essential for carbohydrate metabolism: deficiency leads to nervous disorders and to the disease beriberi. Formula: C 12 H 17 ON 4 SCl.H 2 O: Also: vitamin B 1, aneurin

Origin of thiamine

C20: thio- + (vit) amin

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for thiamine


[ thīə-mĭn ]

  1. A water-soluble pyrimidine derivative belonging to the vitamin B complex that is important in carbohydrate metabolism and normal activity of the nervous system. It is found in pork, organ meats, whole grain cereals, legumes, and nuts. Deficiency of thiamine in the diet results in beriberi. Also called vitamin B1. Chemical formula: C12H17ClN4OS.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.