noun
- European annual wild lettuce having prickly stems; a troublesome weed in parts of United States.
- synonyms: prickly lettuce, Lactuca serriola, Lactuca scariola
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). horse thistle. Retrieved September 21, 2026, from http://smartdefine.org/horse_thistle/definitions/1285642 |
| Chicago | WordNet. 2010. "horse thistle" http://smartdefine.org/horse_thistle/definitions/1285642 (accessed September 21, 2026). |
| Harvard | WordNet 2010, horse thistle, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/horse_thistle/definitions/1285642>. |
| MLA | WordNet. "horse thistle" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/horse_thistle/definitions/1285642> |