genistein
noun
ge·nis·tein jə-ˈni-stē-ən 
-ˈni-ˌstēn
-ˈni-ˌstēn : an isoflavone C15H10O5 found especially in soybeans and shown in laboratory experiments to have antitumor activity
Example Sentences
Recent Examples on the Web Soybeans are high in fiber, as well as compounds called isoflavones, which include daidzein and genistein. 
Maggie Fox, NBC News, 30 Oct. 2017 The idea that plant hormones—such as genistein, the primary phytoestrogen in soy—can interfere with mammalian development is not new. Deborah Blum, Slate Magazine, 3 Aug. 2017
Maggie Fox, NBC News, 30 Oct. 2017 The idea that plant hormones—such as genistein, the primary phytoestrogen in soy—can interfere with mammalian development is not new. Deborah Blum, Slate Magazine, 3 Aug. 2017 Word History
Etymology
genist- (from New Latin Genista tinctoria, a species of broom) + -ein, alteration of -in entry 1
First Known Use
1899, in the meaning defined above
Medical Definition
genistein
noun
ge·nis·tein jə-ˈnis-tē-ən -ˈnis-ˌtēn
-ˈnis-ˌtēn : an isoflavone C15H10O5 found especially in soybeans and shown in laboratory experiments to have antitumor activity