/ Dictionary / Index C citrus canker: Meaning and Definition of Find definitions for: cit'rus can"ker Pronunciation: [key] — Plant Pathol. Plant Pathol. a disease of citrus trees caused by the bacterium Xanthomonas citri, characterized by spongy eruptions on leaves and fruit. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. citrus Citrus Heights Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language