Breadcrumb Home > Dictionary > Index B blue catfish: Meaning and Definition of Find definitions for: blue' cat'fish Pronunciation: [key] a large freshwater catfish, Ictalurus furcatus, that is a popular food fish in the states of the Mississippi River valley. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. blue bull blue cheese ✖ Related Content Daily Word Quiz: dishabille Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language