silymarin
noun
sil·y·mar·in
| \ ˌsil-i-ˈmar-ən
\
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Medical Definition of silymarin
: an antioxidant flavonoid C25H22O10 consisting of a mixture of three isomers isolated from seeds of the milk thistle, held to have properties protecting the liver from or clearing it of toxins, and used in dietary supplements and herbal remedies