riboflavin

 
Pronunciation: /ˌrʌɪbə(ʊ)ˈfleɪvɪn/

noun

[mass noun] Biochemistry
  • a yellow vitamin of the B complex which is essential for metabolic energy production. It is present in many foods, especially milk, liver, eggs, and green vegetables, and is also synthesized by the intestinal flora. Also called vitamin B2.

Origin:

1930s: from ribose + Latin flavus 'yellow' + -in1