diosgenin
[ dahy-oz-jen-in, dahy-oz-juh-nin ]
/ ˌdaɪ ɒzˈdʒɛn ɪn, daɪˈɒz dʒə nɪn /
noun Biochemistry.
a crystalline compound, C27H42O3, the aglycone of dioscin: used in the synthesis of steroidal hormones, as of progesterone.