What is the meaning of Bullweed?

(n.) Knapweed.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). bullweed. Retrieved September 28, 2026, from http://smartdefine.org/bullweed/definitions/1983084
ChicagoWebster's. 2011. "bullweed" http://smartdefine.org/bullweed/definitions/1983084 (accessed September 28, 2026).
HarvardWebster's 2011, bullweed, Smart Define, viewed 28 September, 2026, <http://smartdefine.org/bullweed/definitions/1983084>.
MLAWebster's. "bullweed" 27 May 2011. Web. 28 September 2026. <http://smartdefine.org/bullweed/definitions/1983084>