cyclorama

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A large composite picture placed on the interior walls of a cylindrical room so as to appear in natural perspective to a spectator standing in the center of the room.
2. n. A large curtain or wall, usually concave, hung or placed at the rear of a stage.

Century Dictionary and Cyclopedia

1. n. A representation of a landscape, battle, or other scene, arranged on the walls of a room of cylindrical shape, and so executed as to appear in natural perspective, the spectators occupying a position in the center; a circular panorama.

Wiktionary

1. n. A display consisting of a continuous series of pictures placed on the walls of a circular room so as to appear in natural perspective by a person standing in the middle.
2. n. A large curtain or wall, often concave, hung upstage, in a theatre.

GNU Webster's 1913

1. n. A pictorial view which is extended circularly, so that the spectator is surrounded by the objects represented as by things in nature. The realistic effect is increased by putting, in the space between the spectator and the picture, things adapted to the scene represented, and in some places only parts of these objects, the completion of them being carried out pictorially.

WordNet 3.0

1. n. a picture (or series of pictures) representing a continuous scene