Definition

1. Proper noun:
   • A moon of Jupiter: Callisto is the name of the second-largest natural satellite (moon) orbiting the planet Jupiter. It is one of the four Galilean moons discovered by Galileo Galilei in 1610.

Examples of Usage

• Proper noun:
  • Callisto is heavily cratered and has a very ancient surface.
  • Scientists study Callisto to understand the history of the outer solar system.
  • Of Jupiter's four major moons, Callisto is the farthest from the planet.

Advanced Usage

• In astronomical contexts: The name is used to refer specifically to this celestial body. It is often discussed in relation to the other Galilean moons: Io, Europa, and Ganymede.
  • The potential for a subsurface ocean on Callisto is a topic of scientific debate.

Variants and Related Words

• Galilean moons (noun phrase): The collective name for Jupiter's four largest moons (Io, Europa, Ganymede, Callisto), discovered by Galileo.
• Jovian (adjective): Relating to the planet Jupiter or its system of moons.

Synonyms

• Jupiter IV: A systematic designation for Callisto, indicating it is the fourth major moon from Jupiter.
• Jupiter's moon: A general term of which Callisto is a specific instance.

Notes on Meaning

• Mythological Origin: The name is derived from Greek mythology. Callisto was a nymph associated with the goddess Artemis. The moon was named by the astronomer Simon Marius shortly after its discovery.
• Distinct Meaning: As a proper noun, "Callisto" refers almost exclusively to this moon in modern English. It is not used as a common noun.

Noun

1. the second largest of Jupiter's satellites