cy·a·no·co·bal·a·min (s???-n??k?-b?l??-m?n, s?-?n??-)n. See vitamin B12.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.cyanocobalamin (?sa??n??k???bæl?m?n) or cyanocobalaminen (Biochemistry) a complex red crystalline compound, containing cyanide and cobalt and occurring in liver: lack of it in the tissues leads to pernicious anaemia. Formula: C63H88O14N14PCo. Also: vitamin B12 [C20: from cyano- + cobal(t) + (vit)amin]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014vitamin B1 n. thiamine. [1920?25] vitamin B2 n. riboflavin. [1925?30] vitamin B3 n. nicotinic acid. [1975?80] vitamin B6 n. pyridoxine. [1930?35] vitamin B12 n. a complex water-soluble solid, C63H88N14O14PCo, obtained from liver, milk, eggs, fish, oysters, and clams: a deficiency causes pernicious anemia and disorders of the nervous system. Also called cyanocobalamin, cobalamin, extrinsic factor. [1945?50] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.