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hy·dras·tis | \ hī-ˈdras-təs 
\
\Medical Definition of hydrastis
1 capitalized : a genus of herbs (family Ranunculaceae) having palmately lobed leaves and small greenish flowers and including the goldenseal (H. canadensis)
2 : the dried rhizome and roots of the goldenseal formerly used in pharmacy as a bitter tonic, hemostatic, and antiseptic
— called also goldenseal
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