iso·​fla·​vone ˌī-sō-ˈflā-ˌvōn How to pronounce isoflavone (audio)
: a colorless, crystalline, bioactive ketone C15H10O2
also : any of various usually hydroxyl derivatives of isoflavone (such as genistein and daidzein) that are plant compounds possessing antioxidant and estrogenic activity in the body

Examples of isoflavone in a Sentence

Recent Examples on the Web Several studies have shown that diets high in soy isoflavones are linked to better bone health. Sarah Anzlovar, Ms, Rd, Verywell Health, 18 June 2024 And while consuming too much isoflavone could increase the risk of hyperestrogenism, experts told USA TODAY that will likely never happen from the consumption of soy milk or almond milk. Clare Mulroy, USA TODAY, 21 Apr. 2024 Does soy milk have estrogen? Soy contains isoflavones, a type of plant estrogen that functions similarly to human estrogen but with weaker effects. Clare Mulroy, USA TODAY, 21 Apr. 2024 Food sources of soy don’t contain high enough levels of isoflavones to increase breast cancer risk. Scott Lafee, San Diego Union-Tribune, 28 Nov. 2023 Red clover extract contains a type of natural compound known as isoflavones. Amber Smith, Discover Magazine, 5 Oct. 2023 Rich in isoflavones, another phytoestrogen, soy (think tempeh, tofu and edamame) should appear on your shopping list too. Georgia Day, Vogue, 6 Sep. 2023 Soy contains isoflavones, endocrine disruptors that mimic and interfere with human estrogen. Madeleine Watts, Harper's Magazine, 11 May 2022 And foods like beans, legumes and soy products are rich sources of subtype isoflavones − flavonoids that help keep one's hormones balanced. Daryl Austin, USA TODAY, 25 May 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'isoflavone.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1926, in the meaning defined above

Time Traveler
The first known use of isoflavone was in 1926

Dictionary Entries Near isoflavone

Cite this Entry

“Isoflavone.” Dictionary, Merriam-Webster, Accessed 21 Jul. 2024.

Medical Definition


iso·​fla·​vone -ˈflā-ˌvōn How to pronounce isoflavone (audio)
: a bioactive ketone C15H10O2 noted for its numerous derivatives that are found in plants (as the soybean) and have antioxidant and estrogenic activity
also : any of these derivatives (as daidzein or genistein)

More from Merriam-Webster on isoflavone

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