n.; pl. E. Arenas L. Arenæ [ L. arena, harena, sand, a sandy place. ] 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. [ 1913 Webster ]

2. Any place of public contest or exertion; any sphere of action; as, the arenaof debate; the arena of life. [ 1913 Webster ]

3. (Med.) “Sand” or “gravel” in the kidneys. [ 1913 Webster ]

a. [ L. arenaceus, fr. arena sand. ] Sandy or consisting largely of sand; of the nature of sand; easily disintegrating into sand; friable; as, arenaceous limestone. [ 1913 Webster ]

a. [ L. arenarius, fr. arena sand. ] Sandy; as, arenarious soil. [ 1913 Webster ]

n. [ L. arenatio, fr. arena sand. ] (Med.) A sand bath; application of hot sand to the body. Dunglison. [ 1913 Webster ]

n. a dance performed by dancers in a line, or several lines, consisting mainly of hand and arm movements; also, the name of the song to which the dance is usually performed. It became popular in 1996. [ PJC ]

n. [ NL. Salmo maraena, G. maräne, moräne; -- so called from Lake Morin, in the March of Brandenburg, in Prussia. ] (Zool.) A European whitefish of the genus Coregonus. [ 1913 Webster ]

a. (Anat.) Situated above, or anterior to, the kidneys. -- n. A suprarenal capsule. [ 1913 Webster ]

Suprarenal capsules (Anat.), two small bodies of unknown function in front of, or near, the kidneys in most vertebrates. Also called renal capsules, and suprarenal bodies. [ 1913 Webster ]