noun
- A B vitamin essential for the normal function of the nervous system and the gastrointestinal tract.
- synonyms: nicotinic acid
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). niacin. Retrieved September 21, 2026, from http://smartdefine.org/niacin/definitions/1249697 |
| Chicago | WordNet. 2010. "niacin" http://smartdefine.org/niacin/definitions/1249697 (accessed September 21, 2026). |
| Harvard | WordNet 2010, niacin, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/niacin/definitions/1249697>. |
| MLA | WordNet. "niacin" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/niacin/definitions/1249697> |