noun (n)

• a surface of hardened plaster (as on a wall or ceiling)(noun.artifact)

  Synonym:
  plaster
  

  source: wordnet30
• Plastering used to finish architectural constructions, exterior or interior, especially that used for the lining of rooms. Ordinarly, mortar is used for the greater part of the work, and pure plaster of Paris for the moldings and ornaments.(noun)

  source: webster1913