Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
A perennial herb (Cirsium arvense) in the composite family, native to Europe and naturalized as a noxious weed in North America, having spiny-margined leaves and rose-purple or sometimes white flower heads.
(Plants) the US and Canadian name for creeping thistle
an Old World prickly composite plant, Cirsiumarvense, having small purple or white flower heads, now a troublesome weed in North America.
Switch to new thesaurus
|Noun||1.||Canada thistle - European thistle naturalized in United States and Canada where it is a pernicious weed|