diosgenin
noun
di·os·gen·in
ˌdī-ˌäz-ˈjen-ən
-ˈäz-jə-nən
: 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)
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Merriam-Webster unabridged
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