2. Proper noun. The four and by far largest moons of Jupiter, namely Io, Europa, Ganymede and Callisto, discovered by Galileo Galilei. ¹
¹ Source: wiktionary.com
2. Proper noun. The four and by far largest moons of Jupiter, namely Io, Europa, Ganymede and Callisto, discovered by Galileo Galilei. ¹
¹ Source: wiktionary.com