ri ‧ bo ‧ fla ‧ vin /ˌraɪbəʊˈfleɪvən, ˌraɪbəʊˈfleɪvɪn $ ˌraɪbə-/ BrE AmE noun [uncountable] technical
[ Date: 1900-2000 ; Origin: ribose type of sugar (19-21 centuries) (from arabinose type of sugar (19-21 centuries) , from gum arabic type of natural substance) + Latin flavus 'yellow' ]
↑ vitamin B2, a substance that exists in meat, milk, and some vegetables, and that is important for your health