Any of various common weeds of the genus Centaurea
especially Centaurea nigra.
Any of several perennial composite plants, especially of genera Cirsium, Carduus, Cynara, or Onopordum, having prickly leaves and showy flower heads with prickly bracts.
This plant used as a charge.
The Order of the Thistle, or membership thereof.
This plant seen as the national emblem of Scotland.