powdery scab


: a disease of potato tubers caused by a fungus (Spongospora subterranea) and characterized by nodular discolored lesions which at maturity burst to expose a powdery mass of spores in circular pits surrounded by the lighter colored frayed remnants of the skin of the tuber

called also pock scab

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 powdery scab

Cite this Entry

“Powdery scab.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/powdery%20scab. Accessed 10 Dec. 2023.

Love words? Need even more definitions?

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