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(Plants) another name for sow thistle
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|Noun||1.||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|
Sonchus oleraceus, milkweed - annual Eurasian sow thistle with soft spiny leaves and rayed yellow flower heads
|2.||milk thistle - tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America|