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milk·wort | \ ˈmilk-ˌwərt 
, -ˌwȯrt \
, -ˌwȯrt \Definition of milkwort
: any of a genus (Polygala of the family Polygalaceae, the milkwort family) of herbs and shrubs often having showy flowers with three sometimes crested petals united below into a tube and an irregular calyx with two petaloid sepals
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The first known use of milkwort was in 1578
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