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vitamin B12

n 1  :  a complex cobalt-containing compound C63H88CoN14O14P that occurs esp. in liver, is essential to normal blood formation, neural function, and growth, and is used esp. in treating pernicious and related anemias and in animal feed as a growth factor - called also cyanocobalamin   2  :  any of several compounds similar to vitamin B12 in action but having different chemistry .
Similar sounding terms:  vitamin B  vitamin B1  vitamin B17  vitamin B6 

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