1. Tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America
   - milk thistle, Our Lady's mild thistle, holy thistle, blessed thistle, Silybum marianum

Derived forms: lady's thistles

Type of: herb, herbaceous plant

Part of: genus Silybum, Silybum

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• Punchinello
• punching bag
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• punctilio
• punctilious