cyclorama

/S AY1 K L AO0 R AA1 M AH0/
noun
  1. 1

    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; a circular or semi-circular display.

  2. 2

    A large curtain or wall, often concave, hung upstage, in a theatre.

Synonyms

Source: https://en.wiktionary.org/wiki/cyclorama