We found 24 dictionaries that define the word knapweed:

General (19 matching dictionaries)

1. knapweed: Merriam-Webster
2. knapweed: Oxford Learner's Dictionaries
3. knapweed: American Heritage Dictionary of the English Language
4. knapweed: Collins English Dictionary
5. knapweed: Vocabulary.com
6. knapweed: Wordnik
7. knapweed: Wiktionary
8. knapweed: Webster's New World College Dictionary, 4th Ed.
9. knapweed: Infoplease Dictionary
10. Knapweed, knapweed: Dictionary.com
11. Knapweed: Wikipedia, the Free Encyclopedia
12. Knapweed: Online Plain Text English Dictionary
13. knapweed: Webster's Revised Unabridged, 1913 Edition
14. knapweed: Rhymezone
15. Knapweed: AllWords.com Multi-Lingual Dictionary
16. knapweed: Webster's 1828 Dictionary
17. knapweed: FreeDictionary.org
18. knapweed: Mnemonic Dictionary
19. knapweed: TheFreeDictionary.com

Computing (1 matching dictionary)

20. knapweed: Encyclopedia

Medicine (2 matching dictionaries)

21. online medical dictionary (No longer online)
22. knapweed: Medical dictionary

Science (2 matching dictionaries)

23. Knapweed, Knapweed, Knapweed, Knapweed, Knapweed, Knapweed: Botanical Name listing of Plants
24. Garden Flower, Shrub and Tree Glossary (No longer online)

(Note: See knapweeds as well.)

Definitions from Wiktionary (knapweed) ▸ noun:  Any of various common weeds of the genus Centaurea ▸ noun:  especially Centaurea nigra. Similar: knopweed, buttonweed, bullweed, hardhead, horseknop, centaurea, loggerhead, horseweed, bindweed, wireweed, more... Phrases: spotted knapweed, russian knapweed, lesser knapweed, black knapweed, great knapweed, more... Adjectives: russian, spotted, diffuse, black, greater, purple, woody, strong, common, hard, lesser ▸ Words similar to knapweed ▸ Usage examples for knapweed ▸ Idioms related to knapweed ▸ Wikipedia articles (New!) ▸ Popular adjectives describing knapweed ▸ Words that often appear near knapweed ▸ Rhymes of knapweed ▸ Invented words related to knapweed