milk thistle
1. 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 • Syn: sow thistle • Hypernyms: shrub, bush • Hyponyms: milkweed, Sonchus oleraceus • Member Holonyms: Sonchus, genus Sonchus 2. tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America • Syn: lady's thistle, Our Lady's mild thistle, holy thistle, blessed thistle, Silybum marianum • Hypernyms: herb, herbaceous plant • Member Holonyms: Silybum, genus Silybum
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