The Collaborative International Dictionary of English v.0.48:

Cyclorama \Cy`clo*ra"ma\ (s?`kl?-r?"m? or -r?"m?), n. [Cyclo- +
   Gr. "o`rama sight, spectacle.]
   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.
   [1913 Webster]

WordNet (r) 3.0 (2006):

cyclorama
    n 1: a picture (or series of pictures) representing a continuous
         scene [syn: panorama, cyclorama, diorama]

Moby Thesaurus II by Grady Ward, 1.0:

87 Moby Thesaurus words for "cyclorama":
   abstract, abstraction, act drop, altarpiece, asbestos,
   asbestos board, backdrop, batten, block print, border, cloth,
   collage, color print, copy, cosmorama, coulisse, counterweight,
   curtain, curtain board, daub, decor, diorama, diptych, display,
   drop, drop curtain, engraving, exhibit, exhibition, exposition,
   fire curtain, flat, flipper, fresco, georama, hanging, icon,
   illumination, illustration, image, light show, likeness, miniature,
   montage, mosaic, mural, myriorama, pageant, pageantry, panorama,
   parade, phantasmagoria, photograph, picture, pomp, presentation,
   print, psychedelic show, rag, representation, reproduction, scene,
   scenery, screen, shifting scene, show, side scene, sight,
   spectacle, stage screw, stage show, stained glass window, stencil,
   still life, tab, tableau, tableau vivant, tapestry, teaser,
   tormentor, transformation, transformation scene, triptych,
   wall painting, wing, wingcut, woodcut