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cyanocobalamin cy·a·no·co·bal·a·min (sī'ə-nō'kō-bāl'ə-mĭn, sī-ān'ō-)
See vitamin B12.
a complex water-soluble organic compound that is essential to a number of microorganisms and animals, including humans. Vitamin B12 aids in the development of red blood cells in higher animals. The vitamin, which is unique in that it contains a metallic ion, cobalt, has a complex chemical structure as shown: