/ Dictionary / Index P pentazocine: Meaning and Definition of Find definitions for: pen•taz•o•cine Pronunciation: (pen-taz'u-sēn"), [key] — n. Pharm. a synthetic narcotic analgesic, CHNO, used chiefly for the relief of moderate to severe pain. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pentazocine (Thesaurus) pentavalent Pentecost Related Content Daily Word Quiz: hale Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language