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also  thi*a*min  n :  a vitamin (C12H17N4OS)Cl of the 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 usu. synthesized commercially, that functions in the body as a cocarboxylase and is essential for conversion of carbohydrate to fat and for normal nervous functions, and that is used in nutrition (as in vitamin preparations and in enriching flour and bread) and in medicine - called also vitamin B1  .
Similar sounding terms:  thy·mine 

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