Ganymede (gănˈēmēdˌ) [key], in astronomy, one of the moons, or natural satellites, of Jupiter; the largest natural satellite in the solar system, it is larger than the planet Mercury.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.
About Infoplease, Part of Family Education Network
© 2000–2015 Pearson Education, publishing as Infoplease