/ Dictionary / Index A acyloin: Meaning and Definition of Find definitions for: a•cyl•o•in Pronunciation: (u-sil'ō-in, as'u-loin", as"u-lō'in), [key] — n. Chem. a hydroxy ketone of the general formula RCOCHOHR, where R is an element or group. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acyl group ad Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language