milk_thistle has definitions from the field of botany
1
[ noun ] (botany) 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 terms

shrub milkweed Sonchus

2
[ noun ] (botany) tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America

Related terms

herb Silybum

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