Galilean satellites

Galilean satellites

noun Astronomy.
the four largest and brightest moons of Jupiter: Io, Europa, Ganymede, and Callisto, discovered by Galileo in 1610.
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Galilean satellites is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
the offspring of a zebra and a donkey.
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