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

Derived forms: milk thistles

Type of: bush, herb, herbaceous plant, shrub

Part of: genus Silybum, genus Sonchus, Silybum, Sonchus

Encyclopedia: Milk thistle

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milk pox
milk pudding
milk punch
Milk River
milk round
milk run
milk shake
milk sickness
milk snake
milk sugar
milk thistle
milk tooth
milk vetch
milk wagon
milk whey
milk yield
milkcap
milker
milkily
milkiness
milking ability