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Galilean satellites

plural noun Astronomy.

the four largest and brightest moons of Jupiter: Io, Europa, Ganymede, and Callisto, discovered by Galileo in 1610.

British Dictionary definitions for galilean satellite

Galilean satellite

/ (ˌɡælɪˈleɪən) /

noun

any of the four large satellites of the planet Jupiter – Io, Europa, Ganymede, or Callisto – discovered in 1610 by Galileo