noun Per·o·nos·po·ra \ˌperəˈnäspərə\

Definition of Peronospora

  1. :  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

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of peronospora

New Latin, from perono- + -spora

Seen and Heard

What made you want to look up Peronospora? Please tell us where you read or heard it (including the quote, if possible).


capable of being understood in two ways

Get Word of the Day daily email!