lignan
noun
lig·nan ˈlig-ˌnan 
: any of a class of propyl phenolic dimers including many found in plants and noted for having antioxidant and estrogenic activity
Example Sentences
Recent Examples on the Web Eating flax seeds and pumpkin seeds during the first phase of your cycle is thought to boost estrogen production as your body metabolizes lignan. 
Jaclyn London, Ms, Rd, Cdn, Good Housekeeping, 16 May 2019 One large study found that a higher lignan intake was associated with less decline in cognitive function, memory and processing. Dr. Mehmet Oz, Good Housekeeping, 28 Sep. 2017
Jaclyn London, Ms, Rd, Cdn, Good Housekeeping, 16 May 2019 One large study found that a higher lignan intake was associated with less decline in cognitive function, memory and processing. Dr. Mehmet Oz, Good Housekeeping, 28 Sep. 2017 Word History
Etymology
International Scientific Vocabulary lign- + -an entry 3
First Known Use
1944, in the meaning defined above
Medical Definition
lignan
noun
lig·nan ˈlig-ˌnan
: any of a class of polyphenolic compounds including many found in plants and noted for having antioxidant and estrogenic activity
In the process of digestion, bacteria convert lignans into estrogen-like substances … Wellness Letter
Wellness LetterThe major types of phytoestrogens are thought to be isoflavones, found in soy protein, and lignans, found in flaxseeds, whole grains, and some fruits and vegetables. Consumer Reports
Consumer Reports