The Collaborative International Dictionary
Sapogenin \Sa*pog"e*nin\, n. [Saponin + -gen + -in.] (Chem.) A white crystalline substance obtained by the decomposition of saponin.
Wiktionary
n. (context organic compound English) The steroid constituent of the glycoside ''saponin''
Wikipedia
Sapogenins are the aglycones, or non- saccharide, portions of the family of natural products known as saponins. Sapogenins contain steroid or other triterpene frameworks as their key organic feature. For example, steroidal sapogenins like tiggenin, neogitogenin, and tokorogenin have been isolated from the tubers of Chlorophytum arundinacelum. Some steroidal sapogenins can serve as a practical starting point for the semisynthesis of particular steroid hormones.
Usage examples of "sapogenin".
Several others turned out to be natural sapogenins which we could raise in our artificial climate, and modify into anti-agathics by two or three subsequent fermentation steps.