Etymology
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thiamin (n.)

also thiamine, alternative name for vitamin B1, 1937, coined by U.S. chemist Dr. Robert R. Williams (1886-1965) from thio-, indicating the presence of sulfur, from Greek theion "sulfur," + amine, indicating the amino group. Or the second element might be from vitamin.

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Definitions of thiamin

thiamin (n.)
a B vitamin that prevents beriberi; maintains appetite and growth;
Synonyms: vitamin B" / thiamine / aneurin / antiberiberi factor
From wordnet.princeton.edu