/ Dictionary / Index G Galilean satellites: Meaning and Definition of Find definitions for: Gal'ile'an sat'ellites Pronunciation: [key] — Astron. Astron. the four largest and brightest moons of Jupiter: Io, Europa, Ganymede, and Callisto, discovered by Galileo in 1610. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Galilean Galilean telescope Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language