titan
n. countable C1 Advanced US //ˈtaɪtən// UK //tˈaɪtən// ti·tan
n. the largest moon of the planet Saturn. It is famous because it has a thick atmosphere and liquid on its surface, much like a cold version of Earth.
n. the largest natural satellite of Saturn and the only known moon with a dense atmosphere and stable bodies of surface liquid.
Scientists study Titan to learn about the early history of Earth.
The Huygens probe landed on Titan in 2005, sending back the first images of its icy, orange surface.
While most moons are barren rocks, Titan possesses a complex nitrogen-rich atmosphere and a hydrological cycle based on liquid methane rather than water.
From Ancient Greek Τιτάν (Titán).
Usage
When referring to the specific moon of Saturn, it is treated as a proper noun and always capitalised.