| blessed thistle | (n) annual of Mediterranean to Portugal having hairy stems and minutely spiny-toothed leaves and large heads of yellow flowers, Syn. sweet sultan, Cnicus benedictus |
| milk thistle | (n) tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America, Syn. Our Lady's mild thistle, Silybum marianum, blessed thistle, holy thistle, lady's thistle |
| Blessed thistle | See under Thistle. [ 1913 Webster ] |