Wiktionary
enterolactone
n. (context organic compound English) The lignan lactone ''rac-(8α,8'β)-3,3'-dihydroxylignano-9,9'-lactone''; a phytoestrogen produced by intestinal microflora from precursors in plant food
Wikipedia
Enterolactone
Enterolactone is a mammalian lignan formed by the action of intestinal bacteria from plant lignan precursors present in the diet.