Martian (noun)

1. An inhabitant of the planet Mars.
2. A hypothetical or fictional being from the planet Mars.

Origin:

Late 19th century: from mars, the roman name for the planet, + -ian.

Examples:

1. The scientist believed that there might be martians living on the planet.
2. Martians are often portrayed as having a humanoid appearance.
3. The martian landscape is barren and dry.
4. The martian atmosphere is thin and mostly composed of carbon dioxide.
5. The martian civilization, if it exists, is believed to be far more advanced than ours.