[ nahy-uh-sin ]
/ ˈnaɪ ə sɪn /

noun Biochemistry.

Origin of niacin

First recorded in 1935–40; ni(cotinic) ac(id) + -in2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for niacin


/ (ˈnaɪəsɪn) /


another name for nicotinic acid

Word Origin for niacin

C20: from ni (cotinic) ac (id) + -in
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 niacin


[ nīə-sĭn ]


A crystalline acid that is a component of the vitamin B complex and is used to treat and prevent pellagra.nicotinic acid
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for niacin


[ nīə-sĭn ]

A water-soluble organic acid belonging to the vitamin B complex that is important in carbohydrate metabolism. It is a pyridine derivative and is a precursor of the coenzyme NAD. Niacin is found in liver, fish, and whole-grain foods. Deficiency of niacin in the diet causes pellagra. Also called nicotinic acid. Chemical formula: C6H5NO2.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.