nicotinic acid


noun Biochemistry.

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.

Definition for vitamin b (2 of 7)

vitamin B1


noun

Origin of vitamin B1

First recorded in 1920–25

Definition for vitamin b (3 of 7)

vitamin B9


noun

Definition for vitamin b (4 of 7)

vitamin B2


noun

Origin of vitamin B2

First recorded in 1925–30

Definition for vitamin b (5 of 7)

vitamin B6


noun

Origin of vitamin B6

First recorded in 1930–35

Definition for vitamin b (6 of 7)

vitamin B3


noun

Definition for vitamin b (7 of 7)

vitamin B12


noun

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. 2019

British Dictionary definitions for vitamin b (1 of 6)

vitamin B


noun plural B vitamins

any of the vitamins in the vitamin B complex

British Dictionary definitions for vitamin b (2 of 6)

vitamin B1


noun

another name for thiamine

British Dictionary definitions for vitamin b (3 of 6)

vitamin B12


noun

another name for cyanocobalamin

British Dictionary definitions for vitamin b (4 of 6)

vitamin B2


noun

another name for riboflavin

British Dictionary definitions for vitamin b (5 of 6)

vitamin B6


noun

another name for pyridoxine

British Dictionary definitions for vitamin b (6 of 6)

nicotinic acid


noun

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

Medicine definitions for vitamin b (1 of 6)

vitamin B


n.

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

Medicine definitions for vitamin b (2 of 6)

nicotinic acid


n.

niacin

Medicine definitions for vitamin b (3 of 6)

vitamin B1


n.

thiamine

Medicine definitions for vitamin b (4 of 6)

vitamin B2


n.

riboflavin

Medicine definitions for vitamin b (5 of 6)

vitamin B6


n.

Pyridoxine and related compounds.

Medicine definitions for vitamin b (6 of 6)

vitamin B12


n.

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

Science definitions for vitamin b (1 of 6)

vitamin B


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

Science definitions for vitamin b (2 of 6)

vitamin B1


See thiamine.

Science definitions for vitamin b (3 of 6)

vitamin B2


See riboflavin.

Science definitions for vitamin b (4 of 6)

vitamin B6


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.

Science definitions for vitamin b (5 of 6)

vitamin B12


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

Science definitions for vitamin b (6 of 6)

nicotinic acid

[ nĭk′ə-tĭnĭk, -tēnĭk ]

See niacin.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.