/ Dictionary / Index P prothonotary apostolic: Meaning and Definition of Find definitions for: prothon'otary apostol'ic Pronunciation: [key] — pl. prothonotaries apostolic. a member of the first college of prelates of the Roman Curia. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. prothonotary prothonotary warbler Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language