riboflavin
noun
ri·bo·fla·vin
ˌrī-bə-ˈflā-vən 
ˈrī-bə-ˌflā-
: 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
Examples of riboflavin in a Sentence
Recent Examples on the Web
Additionally, almond butter is an excellent source of magnesium, manganese, riboflavin, and vitamin E, while peanut butter is an excellent source of manganese and niacin.1 When consuming either option, portion control is important.
—
T'keyah Bazin, Verywell Health, 6 Aug. 2025
And whole wheat bread contains essential B vitamins such as thiamin, riboflavin and niacin that are critical for energy production, red blood cell formation and nervous system function.
—Daryl Austin, USA Today, 31 July 2025
While research shows that certain vitamin deficiencies—such as iron, riboflavin, biotin, and in some cases, vitamin D—can be associated with hair loss, there is not sufficient evidence to support the idea that supplementation of these nutrients fuels hair growth.
—Abbey Stone, Bon Appetit Magazine, 31 July 2025
However, a cup of fortified oat milk provides 20% or more of the DV for B12, riboflavin, phosphorus, and calcium.
—Jillian Kubala, Health, 27 Feb. 2025
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T'keyah Bazin, Verywell Health, 6 Aug. 2025
And whole wheat bread contains essential B vitamins such as thiamin, riboflavin and niacin that are critical for energy production, red blood cell formation and nervous system function.
—Daryl Austin, USA Today, 31 July 2025
While research shows that certain vitamin deficiencies—such as iron, riboflavin, biotin, and in some cases, vitamin D—can be associated with hair loss, there is not sufficient evidence to support the idea that supplementation of these nutrients fuels hair growth.
—Abbey Stone, Bon Appetit Magazine, 31 July 2025
However, a cup of fortified oat milk provides 20% or more of the DV for B12, riboflavin, phosphorus, and calcium.
—Jillian Kubala, Health, 27 Feb. 2025
See All Example Sentences for riboflavin
Cite this Entry
“Riboflavin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/riboflavin. Accessed 20 Aug. 2025.
Copy CitationKids Definition
riboflavin
noun
ri·bo·fla·vin
ˌrī-bə-ˈflā-vən
: a vitamin of the vitamin B complex that helps growth and is found both free (as in milk) and combined with other substances (as in liver)
called also vitamin B2
Medical Definition
riboflavin
noun
ri·bo·fla·vin
ˌrī-bə-ˈflā-vən, ˈrī-bə-ˌ
variants
also riboflavine
: a yellow crystalline compound C17H20N4O6 that is a growth-promoting member of the vitamin B complex and occurs both free (as in milk) and combined (as in liver)
called also lactoflavin, ovoflavin, vitamin B2
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