/ Dictionary / Index B blackfire: Meaning and Definition of Find definitions for: black•fire Pronunciation: (blak'fīr"), [key] — n. Plant Pathol. a disease of tobacco, characterized by angular, dark lesions on the leaves, caused by a bacterium, Pseudomonas angulata. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. blackfin blackfish 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