milk thistle   (TTS Sound)

The noun milk thistle has 2 senses

• sow thistle, milk thistle -- (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)


• 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)