noun
- A coarse prickly European weed with spikes of blue flowers; naturalized in United States.
- synonyms: blueweed, blue devil, viper's bugloss, Echium vulgare
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). blue thistle. Retrieved September 20, 2026, from http://smartdefine.org/blue_thistle/definitions/1260904 |
| Chicago | WordNet. 2010. "blue thistle" http://smartdefine.org/blue_thistle/definitions/1260904 (accessed September 20, 2026). |
| Harvard | WordNet 2010, blue thistle, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/blue_thistle/definitions/1260904>. |
| MLA | WordNet. "blue thistle" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/blue_thistle/definitions/1260904> |