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 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.