Arena
Pronunciation : A*re"na
Part of Speech : n.; pl. E. Arenas; L. Aren?.
Etymology : [L. arena, harena, sand, a sandy place.]
Definition : 1. (Rom. Antiq.)
Defn: The area in the central part of an amphitheater, in which the gladiators fought and other shows were exhibited; -- so called because it was covered with sand.
2. Any place of public contest or exertion; any sphere of action; as, the arenaof debate; the arena of life.
3. (Med.)
Defn: "Sand" or "gravel" in the kidneys.
Source : Webster's Unabridged Dictionary, 1913