niacin
Americannoun
noun
Etymology
Origin of niacin
First recorded in 1935–40; ni(cotinic) ac(id) + -in 2
Compare meaning
How does niacin compare to similar and commonly confused words? Explore the most common comparisons:
Vocabulary lists containing niacin
Nutrition - Middle School
Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!
Nutrition - High School
Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!
Nutrition and Digestion - High School
Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Researchers emphasize that high doses of vitamins, including niacin, can be toxic and may cause harm if they are not carefully monitored by medical professionals.
From Science Daily ● Jun. 22, 2026
Early experiments showed that niacin extended survival, leading the team to launch a Phase I and II clinical trial in people.
From Science Daily ● Jun. 22, 2026
Researchers at the University of Calgary are studying whether high doses of vitamin B3, also known as niacin, could improve outcomes when added to conventional glioblastoma treatment.
From Science Daily ● Jun. 22, 2026
Flour is already fortified with calcium, niacin, thiamine and iron as a means of improving public health.
From BBC ● Nov. 14, 2024
The way to unlock the niacin in corn is to cook it with an alkali like lime.
From "The Omnivore's Dilemma" by Michael Pollan
![]()
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.