1.Definition: 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

Related Noun(s):sow thistle

Category: Plants

2.Definition: tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America

Related Noun(s):blessed thistle, holy thistle, silybum marianum

Category: Plants