/ Dictionary / Index B butyral: Meaning and Definition of Find definitions for: bu•tyr•al Pronunciation: (by'tu-ral", -tur-ul), [key] — n. Chem. any acetal of butyraldehyde. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. butyraceous butyraldehyde Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language