milk thistle, n.
tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America
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Our Lady's mild thistle Silybum marianum blessed thistle holy thistle lady's thistle milk thistle
any of several Old World coarse prickly-leaved shrubs and subshrubs having milky juice and yellow flowers; widely naturalized; often noxious weeds in cultivated soil
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milk thistle sow thistle
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