Noun holy thistle has 1 sense
  1. milk thistle, lady's thistle, Our Lady's mild thistle, holy thistle, blessed thistle, Silybum marianum - tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America
    --1 is a kind of herb, herbaceous plant
    --1 is a member of Silybum, genus Silybum
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