[ rahy-boh-fley-vin, rahy-boh-fley-, -buh- ]
/ ˌraɪ boʊˈfleɪ vɪn, ˈraɪ boʊˌfleɪ-, -bə- /

noun Biochemistry.

a vitamin B complex factor appearing as an orange-yellow, crystalline compound, C17H20N4O6, derived from ribose, essential for growth, found in milk, fresh meat, eggs, leafy vegetables, etc., or made synthetically, and used in enriching flour, in vitamin preparations, and in treating facial lesions.
Also ri·bo·fla·vine [rahy-boh-fley-vin, -veen] /ˌraɪ boʊˈfleɪ vɪn, -vin/.

Origin of riboflavin

First recorded in 1930–35; ribo(se) + flavin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for riboflavin

British Dictionary definitions for riboflavin



/ (ˌraɪbəʊˈfleɪvɪn) /


a yellow water-soluble vitamin of the B complex that occurs in green vegetables, germinating seeds, and in milk, fish, egg yolk, liver, and kidney. It is essential for the carbohydrate metabolism of cells. It is used as a permitted food colour, yellow or orange-yellow (E101). Formula: C 17 H 20 N 4 O 6Also: vitamin B 2, lactoflavin

Word Origin for riboflavin

C20: from ribose + flavin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for riboflavin


[ rībō-flā′vĭn, -bə- ]


An orange-yellow crystalline compound that is the principal growth-promoting factor in the vitamin B complex, naturally occurring in milk, leafy vegetables, fresh meat, and egg yolks.lactoflavin vitamin B2
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for riboflavin


[ rībō-flā′vĭn ]

A water-soluble compound belonging to the vitamin B complex that is important in carbohydrate metabolism and the maintenance of mucous membranes. Riboflavin is found in milk, leafy vegetables, meat, and egg yolks. Also called vitamin B2. Chemical formula: C17H20N4O6.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.