niacin

[nahy-uh-sin]
noun Biochemistry.

Origin:
1935–40; ni(cotinic) ac(id) + -in2

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Collins
World English Dictionary
niacin (ˈnaɪəsɪn)
 
n
another name for nicotinic acid
 
[C20: from ni(cotinic) ac(id) + -in]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

niacin
"pellagra-preventing vitamin in enriched bread," 1942, coined from ni(cotinic) ac(id) + -in, chemical suffix; suggested by the merican 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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American Heritage
Medical Dictionary

niacin ni·a·cin (nī'ə-sĭn)
n.
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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American Heritage
Science Dictionary
niacin   (nī'ə-sĭn)  Pronunciation Key 
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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Example sentences
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.
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