milk thistle Meaning, Definition & Usage
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noun 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
sow thistle.
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noun tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America
Silybum marianum; holy thistle; lady's thistle; Our Lady's mild thistle; blessed thistle.
