/ Dictionary / Index B blackfin: Meaning and Definition of Find definitions for: black•fin Pronunciation: (blak'fin"), [key] — n. a cisco, Coregonus nigripinnis, found in the Great Lakes. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. black-figure blackfire 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