diosgenin
noun
di·os·gen·in
| \ ˌdī-ˌäz-ˈjen-ən
, -ˈäz-jə-nən
\
, -ˈäz-jə-nən
\
Medical Definition of diosgenin
: a crystalline steroid sapogenin C27H42O3 obtained especially from yams (genus Dioscorea) and used as a starting material for the synthesis of steroid hormones (as cortisone and progesterone)