/ Dictionary / Index B buckwheat coal: Meaning and Definition of Find definitions for: buck'wheat coal" Pronunciation: [key] anthracite in sizes ranging from to in. (14 to 8 mm). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. buckwheat cake buckwheat family Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language