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  1. Oxford American Dictionary

    vitamin B

    • IPA[ˈvīdəmən bē]
    • n.
      any of a group of substances (the vitamin B complex) which are essential for the working of certain enzymes in the body and, although not chemically related, are generally found together in the same foods. They include thiamine (vitamin B1), riboflavin (vitamin B2), pyridoxine (vitamin B6), and cyanocobalamin (vitamin B12).

    • noun: vitamin B