Definition

1. Proper noun:
   • A member of an ancient Macedonian dynasty that ruled Egypt: Refers to any of the kings in the Ptolemaic dynasty, which governed Egypt from the death of Alexander the Great (323 BC) until the Roman conquest (30 BC).
   • A famous astronomer from Alexandria: Refers specifically to Claudius Ptolemaeus, a 2nd-century AD scholar whose astronomical and geographical theories were authoritative for centuries.

Usage Examples

• Proper noun (Dynasty):

  • Ptolemy I Soter was a general under Alexander the Great.
  • The last ruler of the Ptolemaic line was Cleopatra VII.

• Proper noun (Astronomer):

  • Ptolemy's geocentric model placed the Earth at the center of the universe.
  • In his work the *Almagest, Ptolemy cataloged stars and planetary motions.*

Advanced Usage

• "Ptolemaic" (adj): Pertaining to the dynasty or the astronomical system.
  • The Ptolemaic Kingdom was a center of Hellenistic culture.
  • The Ptolemaic system was complex, using epicycles to explain planetary movement.

Variants and Related Words

• Ptolemaic (adjective): Of or relating to the Ptolemies of Egypt or the astronomical theories of Ptolemy.
• Ptolemaist (noun, historical): A supporter of the Ptolemaic system of astronomy.

Synonyms

• For the dynasty: Ptolemaic king, Hellenistic ruler of Egypt.
• For the astronomer: Claudius Ptolemaeus (full name), the Alexandrian astronomer.

Notes on Different Meanings

• The two primary references are distinct: one is a historical line of rulers, and the other is a specific historical figure known for scholarship. Context clarifies which is intended. The astronomer is often referred to with his work, e.g., "Ptolemy's ."

Noun

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