A fluorescent product of riboflavin catabolism, or perhaps riboflavin itself, found in mammalian urine and faeces. ... (05 Mar 2000) ... 
Type: Term Pronunciation: yūr′ō-flā′vin Definitions: 1. A fluorescent product of riboflavin catabolism, or perhaps riboflavin itself, found in mammalian urine and feces.