To save this word, you'll need to log in.
Per·o·nos·po·ra | \ ˌperəˈnäspərə\
Definition of Peronospora
: a genus (the type of the family Peronosporaceae) of destructive downy mildews having the sporangiophores dichotomously branched and with pointed tips — see onion mildew, tobacco blue mold
Keep scrolling for more
Comments on Peronospora
What made you want to look up Peronospora? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
Pass the Little Ribbons: A Pasta Word Quiz
- Match the pasta to its meaning in English: Rotelle
Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
- Pass the Little Ribbons: A Pasta Word Quiz
Match the pasta with its meaning in Italian.
Take the quiz - Confusing Words—A Quiz
Test your knowledge of these commonly confused words!
Take the quiz - Spell It
Can you spell these 10 commonly misspelled words?
Take the quiz - Dictionary Devil
The dictionary has been scrambled—can you put it back together?
Play the game
Share Peronospora
Resources for Peronospora