Definition of riboflavin
: a yellow crystalline compound C17H20N4O6 of the vitamin B complex that occurs both free (as in milk) and combined (as in liver) as a component of coenzymes (such as FMN) which are essential to normal metabolism
— called also vitamin B2
Buying Guide
Our Reviews team has selected the best rice cookers.
Test Your Vocabulary
Name That Color
-
- Name that color:

Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share riboflavin
Time Traveler for riboflavin
The first known use of riboflavin was in 1935
See more words from the same year