/ Dictionary / Index R ring rot: Meaning and Definition of Find definitions for: ring' rot" Pronunciation: [key] — Plant Pathol. Plant Pathol. a disease of potatoes, characterized by wilted foliage and rotting of the ring of vascular bundles in the tubers, caused by a bacterium, Corynebacterium sepedonicum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ring-porous ringsail Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language