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vitamin B12

noun

  1. a deep-red crystalline, water-soluble solid, C 63 H 88 N 14 O 14 PCo, obtained from liver, milk, eggs, fish, oysters, and clams: a deficiency causes pernicious anemia and disorders of the nervous system.


vitamin B12

noun

  1. another name for cyanocobalamin
“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

  1. A water-soluble, complex organic compound containing cobalt, found especially in meat, liver, eggs, milk, and milk products. Vitamin B 12 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 B 12 in the diet results in pernicious anemia .
  2. Also called cobalamin cyanocobalamin


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Word History and Origins

Origin of vitamin B121

First recorded in 1945–50
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Compare Meanings

How does vitamin B12 compare to similar and commonly confused words? Explore the most common comparisons:

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Example Sentences

Clemens insists that the only shots McNamee gave him were Vitamin B12.

Iron deficiency can cause anemia, as can vitamin B12 or folic acid deficiency.

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vitamin B1vitamin B2