/ Dictionary / Index P Prometheus Unbound*: Meaning and Definition of Find definitions for: Prome'theus Unbound' Pronunciation: [key] a drama in verse (1820) by Shelley. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Prometheus Bound* promethium Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language