/ Dictionary / Index P propyl: Meaning and Definition of Find definitions for: pro•pyl Pronunciation: (prō'pil), [key] — adj. Chem. containing a propyl group. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: propyl (Thesaurus) prop wash propylaeum Related Content Daily Word Quiz: miscreant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language