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Definition of Milk thistle
1. Noun. 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.
Exact synonyms: Sow Thistle
Group relationships: Genus Sonchus, Sonchus
Specialized synonyms: Milkweed, Sonchus Oleraceus
Generic synonyms: Bush, Shrub
Group relationships: Genus Sonchus, Sonchus
Specialized synonyms: Milkweed, Sonchus Oleraceus
Generic synonyms: Bush, Shrub
2. Noun. Tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America.
Exact synonyms: Blessed Thistle, Holy Thistle, Lady's Thistle, Our Lady's Mild Thistle, Silybum Marianum
Group relationships: Genus Silybum, Silybum
Generic synonyms: Herb, Herbaceous Plant
Group relationships: Genus Silybum, Silybum
Generic synonyms: Herb, Herbaceous Plant
Definition of Milk thistle
1. Noun. Any of the thistles in the genus ''Silybum''. ¹
¹ Source: wiktionary.com