plural noun

: an order of saprophytic and parasitic ascomycetous fungi (subclass Euascomycetes) that live on plants, have both vegetative and reproductive structures superficial on the host, and include the powdery mildews, many sooty molds, and a few other epiphytic fungi see erysiphaceae

Word History


New Latin, from Erysiphe + -ales

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.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Dictionary Entries Near Erysiphales

Cite this Entry

“Erysiphales.” Dictionary, Merriam-Webster, Accessed 18 Apr. 2024.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!