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vitamin B12

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noun
  1. a deep-red crystalline, water-soluble solid, C63H88N14O14PCo, obtained from liver, milk, eggs, fish, oysters, and clams: a deficiency causes pernicious anemia and disorders of the nervous system.
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Origin of vitamin B12

First recorded in 1945–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for vitamin b12

vitamin B12

noun
  1. another name for cyanocobalamin
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

vitamin b12 in Medicine

vitamin B12

n.
  1. A complex compound containing cobalt, found especially in liver and widely used to treat pernicious anemia.antipernicious anemia factor cobalamin cyanocobalamin extrinsic factor
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

vitamin b12 in Science

vitamin B12

  1. A water-soluble, complex organic compound containing cobalt, found especially in meat, liver, eggs, milk, and milk products. Vitamin B12 is necessary for the synthesis of DNA by the body, for the production of blood cells, and for maintaining the health of nerves. A deficiency of vitamin B12 in the diet results in pernicious anemia. Also called cobalamin cyanocobalamin
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.