We found 19 dictionaries that define the word powdery mildew:

General (14 matching dictionaries)

1. powdery mildew: Merriam-Webster
2. powdery mildew: Oxford Learner's Dictionaries
3. powdery mildew: American Heritage Dictionary of the English Language
4. powdery mildew: Collins English Dictionary
5. powdery mildew: Vocabulary.com
6. powdery mildew: Wordnik
7. powdery mildew: Wiktionary
8. powdery mildew: Infoplease Dictionary
9. powdery mildew: Dictionary.com
10. Powdery mildew (barley), Powdery mildew: Wikipedia, the Free Encyclopedia
11. powdery mildew: Rhymezone
12. powdery mildew: FreeDictionary.org
13. powdery mildew: Mnemonic Dictionary
14. powdery mildew: TheFreeDictionary.com

Art (1 matching dictionary)

15. Epicurus.com Wine Glossary (No longer online)

Computing (1 matching dictionary)

16. powdery mildew: Encyclopedia

Science (2 matching dictionaries)

17. Agricultural Thesaurus and Glossary (No longer online)
18. Botanical Terms (No longer online)

Tech (1 matching dictionary)

19. Agriculture Glossary (No longer online)

(Note: See powdery_mildews as well.)

Definitions from Wiktionary (powdery mildew) ▸ noun:  A mildew affecting many important food crops, caused by fungi of the order Erysiphales. Similar: mildew, oidium, mildewer, pleosporalean, rhynchosporium, smut, mazaedium, eumycete, peronosporale, white rust, more... Opposite: downy mildew, healthy, unaffected, robust, strong ▸ Words similar to powdery mildew ▸ Usage examples for powdery mildew ▸ Idioms related to powdery mildew ▸ Wikipedia articles (New!) ▸ Words that often appear near powdery mildew ▸ Rhymes of powdery mildew ▸ Invented words related to powdery mildew