noun
- European thistle with rather large heads and prickly leaves; extensively naturalized as a weed in the United States.
- synonyms: bull thistle, boar thistle, Cirsium vulgare, Cirsium lanceolatum
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). spear thistle. Retrieved September 23, 2026, from http://smartdefine.org/spear_thistle/definitions/1312154 |
| Chicago | WordNet. 2010. "spear thistle" http://smartdefine.org/spear_thistle/definitions/1312154 (accessed September 23, 2026). |
| Harvard | WordNet 2010, spear thistle, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/spear_thistle/definitions/1312154>. |
| MLA | WordNet. "spear thistle" 23 October 2010. Web. 23 September 2026. <http://smartdefine.org/spear_thistle/definitions/1312154> |