ARENA

A‐re″na (�), n.; pl. E. Arenas (�); L. Arenæ (�). [[L. arena, harena, sand, a sandy place.]] 1. 1. (Rom. Antiq.) 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. 2. Any place of public contest or exertion; any sphere of action; as, the arenaof debate; the arena of life.
3. 3. (Med.) “Sand” or “gravel” in the kidneys.