1. blue thistle a coarse prickly European weed with spikes of blue flowers
  2. bull thistle European thistle with rather large heads and prickly leaves
  3. plume thistle any of numerous biennial to perennial herbs with handsome purple or yellow or occasionally white flower heads
  4. boar thistle European thistle with rather large heads and prickly leaves
  5. holy thistle tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America
  6. plumed thistle any of numerous biennial to perennial herbs with handsome purple or yellow or occasionally white flower heads
  7. boat whistle a whistle on a boat that is sounded as a warning
  8. woolly thistle biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America
  9. blessed thistle tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America
  10. globe thistle any of various plants of the genus Echinops having prickly leaves and dense globose heads of bluish flowers
  11. brook thistle of central and southwestern Europe
  12. milk thistle 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
  13. Paul the Apostle a Christian missionary to the Gentiles
  14. polytheistic worshipping or believing in more than one god
  15. white thistle any plant of the genus Argemone having large white or yellow flowers and prickly leaves and stems and pods; chiefly of tropical America
  16. field thistle stout North American thistle with purplish-pink flower heads
  17. spear thistle European thistle with rather large heads and prickly leaves
  18. thistle any of numerous plants of the family Compositae and especially of the genera Carduus and Cirsium and Onopordum having prickly-edged leaves
  19. bluebottle an annual Eurasian plant cultivated in North America having showy heads of blue or purple or pink or white flowers
  20. sow thistle 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