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[nahy-uh-sin] /ˈnaɪ ə sɪn/
noun, Biochemistry
Origin of niacin
1935-40; ni(cotinic) ac(id) + -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for niacin
  • If you do start taking niacin, watch out for flushing.
  • Unfortunately, there isn't enough niacin here to have this benefit.
  • His good cholesterol is too low, so he has been considering taking a niacin supplement.
  • Potatoes are full of carbohydrates, as well as calcium, niacin and some protein.
  • The variation makes it harder for the enzyme to make use of niacin.
  • Breads are comparatively low in fat and sodium, and provide a good amount of thiamine and niacin.
  • Also, pharmaceutical-grade niacin is more reliable in purity and potency, and it is covered by many insurance plans.
  • Although niacin is available over the counter, the active form used for cholesterol treatment is given in much higher doses.
  • Bile-acid binding resins or niacin may be considered.
  • niacin can cause severe flushing, making people feel hot and reddening their faces.
British Dictionary definitions for niacin


another name for nicotinic acid
Word Origin
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
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Word Origin and History for niacin

"pellagra-preventing vitamin in enriched bread," 1942, coined from ni(cotinic) ac(id) + -in (2), chemical suffix; suggested by the American Medical Association as a more commercially viable name than nicotinic acid.

The new name was found to be necessary because some anti-tobacco groups warned against enriched bread because it would foster the cigarette habit. ["Cooperative Consumer," Feb. 28, 1942]

Online Etymology Dictionary, © 2010 Douglas Harper
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niacin in Medicine

niacin ni·a·cin (nī'ə-sĭn)
A crystalline acid that is a component of the vitamin B complex and is used to treat and prevent pellagra. Also called nicotinic acid.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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niacin in Science
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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