- aresThe Greek god of war, usually described as a son of Zeus and Hera, companion of Eris and Enyo, and by Aphrodite father of Deimos and Phobos.
- areo-Relating to Mars.
- areoidThe analogue of the geoid for the planet Mars; the Martian geoid. The gravitational and rotational equipotential surface for Mars. The surface that provides the datum line (the equivalent for sea level) for Mars.