/ Dictionary / Index P pentyl: Meaning and Definition of Find definitions for: pen•tyl Pronunciation: (pen'tl), [key] — adj. Chem. containing a pentyl group; amyl. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pent-up pentylenetetrazol Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language