We found 25 dictionaries that define the word butterbur:

General (18 matching dictionaries)

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

Medicine (5 matching dictionaries)

19. Butterbur: MedTerms.com Medical Dictionary
20. online medical dictionary (No longer online)
21. Butterbur: Glossary of Herbs, Botanicals and Other Products
22. butterbur: Medical dictionary
23. Butterbur: Drug Medical Dictionary

Science (1 matching dictionary)

24. A Modern Herbal, 1931, by Mrs. M. Grieve (No longer online)

Slang (1 matching dictionary)

25. butterbur: Urban Dictionary

(Note: See butterburs as well.)

Definitions from Wiktionary (butterbur) ▸ noun:  Any of several Eurasian herbs, of the genus Petasites, having dense clusters of often purple flowers. Similar: bog rhubarb, Petasites hybridus, petasites vulgaris, giant butterbur, fuki, bistort, butterdock, Arctic butterbur, coltsfoot, basketflower, more... Phrases: butterbur coltsfoot, giant butterbur, more... ▸ Words similar to butterbur ▸ Usage examples for butterbur ▸ Idioms related to butterbur ▸ Wikipedia articles (New!) ▸ Popular adjectives describing butterbur ▸ Words that often appear near butterbur ▸ Rhymes of butterbur ▸ Invented words related to butterbur