/ Dictionary / Index P PB: Meaning and Definition of Find definitions for: PB Pronunciation: [key] power brakes. Pb Pronunciation: [key] — Symbol, Chem. lead. P.B. Pronunciation: [key] British Pharmacopoeia. Prayer Book. p.b. Pronunciation: [key] — Baseball. Baseball. passed ball; passed balls. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pb (Thesaurus) Pazyryk PBA Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language