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