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Definition of 'milk thistle'

Noun

  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
       Synonyms: sow thistle
  2. tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America
       Synonyms: lady's thistle Our Lady's mild thistle holy thistle blessed thistle Silybum marianum


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