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nicotinic acid

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noun Biochemistry.
  1. a crystalline acid, C6H5NO2, that is a component of the vitamin-B complex, found in fresh meat, yeast, etc., produced by the oxidation of nicotine, and used in the prevention and treatment of pellagra.

Origin of nicotinic acid

First recorded in 1885–90
Also called niacin, vitamin B3.

vitamin B1

noun
  1. thiamine.

Origin of vitamin B1

First recorded in 1920–25

vitamin B9

noun
  1. folic acid.

vitamin B2

noun
  1. riboflavin.

Origin of vitamin B2

First recorded in 1925–30

vitamin B6

noun
  1. pyridoxine.

Origin of vitamin B6

First recorded in 1930–35

vitamin B3

noun
  1. nicotinic acid.

vitamin B12

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.

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 b

vitamin B

noun plural B vitamins
  1. any of the vitamins in the vitamin B complex

vitamin B1

noun
  1. another name for thiamine

vitamin B12

noun
  1. another name for cyanocobalamin

vitamin B2

noun
  1. another name for riboflavin

vitamin B6

noun
  1. another name for pyridoxine

nicotinic acid

noun
  1. a vitamin of the B complex that occurs in milk, liver, yeast, etc. Lack of it in the diet leads to the disease pellagra. Formula: (C 5 H 4 N)COOHAlso called: niacin
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 b in Medicine

vitamin B

n.
  1. Vitamin B complex.
  2. A member of the vitamin B complex, especially thiamine.

nicotinic acid

n.
  1. niacin

vitamin B1

n.
  1. thiamine

vitamin B2

n.
  1. riboflavin

vitamin B6

n.
  1. Pyridoxine and related compounds.

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

vitamin b in Science

vitamin B

  1. Vitamin B complex.
  2. A member of the vitamin B complex, especially thiamine (vitamin B1).

vitamin B1

  1. See thiamine.

vitamin B2

  1. See riboflavin.

vitamin B6

  1. Any of several water-soluble pyridine derivatives, especially pyridoxine, that are coenzymes in amino acid synthesis and are important in protein and fat metabolism and in healthy nerve function. Vitamin B6 is found in liver, whole-grain foods, fish, yeast, and many vegetables.

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

nicotinic acid

[nĭk′ə-tĭnĭk, -tēnĭk]
  1. See niacin.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.