Noun sow thistle has 1 sense
  1. 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
    --1 is a kind of shrub, bush
    --1 is a member of Sonchus, genus Sonchus
    --1 has particulars: milkweed, Sonchus oleraceus
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