/ Dictionary / Index P Ptolemy I: Meaning and Definition of Find definitions for: Ptolemy I Pronunciation: [key] (surnamed Soter) 367?–280b.c., ruler of Egypt 323–285: founder of Macedonian dynasty in Egypt. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Ptolemy Ptolemy II Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language