Enceladus
noun
En·cel·a·dus
| \ en-ˈse-lə-dəs
\
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Definition of Enceladus
astronomy
: the sixth largest satellite of Saturn that has a diameter of approximately 310 miles (500 km) and is characterized by geological activity and the presence of liquid water
Images revealed a terrain of faults, folds, and ridges devoid of craters, further evidence that Enceladus is one of the most geologically active places in the solar system.— Ron Cowen, Science News, 6 May 2006