Canada-thistle definition
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.
noun
A prickly European weed (Cirsium arvense) of the composite family, with heads of purplish flowers and wavy leaves: now common as a fast-spreading, injurious weed throughout the N U.S.
noun
Corn thistle.
noun
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Other Word Forms
Noun
Singular:
canada-thistle
Plural:
canada-thistles