ptolemy Meaning, Definition & Usage

1. noun Alexandrian astronomer (of the 2nd century) who proposed a geocentric system of astronomy that was undisputed until the late Renaissance
   Claudius Ptolemaeus.
   
2. noun an ancient dynasty of Macedonian kings who ruled Egypt from 323 BC to 30 BC; founded by Ptolemy I and ended with Cleopatra
   Ptolemaic dynasty.
   

WordNet