prop. n.Proper NounThe third-largest natural satellite of Saturn, characterized by its extreme difference in albedo between its leading and trailing hemispheres.
Iapetus is the third-largest natural satellite of Saturn.
prop. n.Proper NounIn Greek mythology, a Titan, son of Uranus and Gaia, and father of Atlas, Prometheus, Epimetheus, and Menoetius.
In Greek mythology, Iapetus was a Titan, son of Uranus and Gaia.