noun 1. The seventh planet from the sun in the solar system. This planet's blue color is the result of methane gas in the atmosphere. 2. This planet is named for the god of the heavens and the father of the Titans in Greek mythology.
noun 1. In Roman mythology, this planet is named after the goddess of love and beauty. 2. The second planet from the sun in the solar system. It has a diameter of about 7,500 miles and a dense, cloudy atmosphere.