/ Dictionary / Index B black frost: Meaning and Definition of Find definitions for: black' frost' Pronunciation: [key] intense cold without hoarfrost, causing vegetation to turn black. Cf. frost (def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Black Friar black gang Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language