potato scab

noun

Definition of potato scab

: any of various diseases of the potato characterized by crusty rough spots or scabs on the tubers; specifically : a disease that is characterized by lesions of brownish corky tissue, is caused by an actinomycete (Streptomyces scabies), and is especially damaging in alkaline soils called also corky scab ; compare powdery scab

There's more!

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!
Already a subscriber? Log in.

Seen and Heard

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

Love words? Need even more definitions?

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

Love words? Need even more definitions?

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