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Galilean satellites

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plural noun Astronomy.
  1. the four largest and brightest moons of Jupiter: Io, Europa, Ganymede, and Callisto, discovered by Galileo in 1610.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for galilean satellite

Galilean satellite

noun
  1. any of the four large satellites of the planet Jupiter – Io, Europa, Ganymede, or Callisto – discovered in 1610 by Galileo
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012