/ Dictionary / Index D decyl: Meaning and Definition of Find definitions for: dec•yl Pronunciation: (des'ul), [key] — n. Chem. a group of isomeric univalent radicals, CH, derived from the decanes by removing one hydrogen atom. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. decussation decyl alcohol Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language