The Collaborative International Dictionary of English v.0.48:
vitamin B1 \vitamin B1\ n. a B vitamin (C12H17N4OS)Cl that prevents beriberi and maintains appetite and growth. Same as thiamine. Syn: thiamin, aneurin, antiberiberi factor. [WordNet 1.5]WordNet (r) 3.0 (2006):
vitamin B1 n 1: a B vitamin that prevents beriberi; maintains appetite and growth [syn: vitamin B1, thiamine, thiamin, aneurin, antiberiberi factor]