milk thistle

1. (noun) tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America
Synonyms: Our Lady's mild thistle, Silybum marianum, blessed thistle, holy thistle, lady's thistle
Related Words: herb, herbaceous plant

2. (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
Synonyms: sow thistle
Related Words: Sonchus oleraceus, bush, milkweed, shrub



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