| 1. | Also, Kallisto. Classical Mythology. a nymph attendant on Artemis, punished for a love affair with Zeus by being changed into a bear and then transformed into stars as the constellation Ursa Major. |
| 2. | Astronomy. a large natural satellite of the planet Jupiter. |
| Callisto (kə-lĭs'tō) Pronunciation Key
One of the four brightest satellites of Jupiter and the eighth in distance from the planet. Originally sighted by Galileo, it is the largest planetary satellite. |