areo-, are- +

(Greek: of, or pertaining to "god of war", Ares or Mars, used primarily in astronomy)

areography
A written description of the physical features of Mars.
areology
The study of the planet Mars.
Areopagite
A member of the Areopagus.
Areopagus
1. Name of a hill west of the Acropolis in Athens and of the tribunal situated on it.
2. The council of the hill of Ares.
Ares
The Greek god of war, identified by the Romans with Mars; from Greek mythology.

Related "war, war-like" or "battle" word units: belli-; -machy; milit-.