noun (n)

• proof by a process of argument or a series of proposition proving an asserted conclusion(noun.communication)

  Synonym:
  demonstration
  

  source: wordnet30
• (Roman Catholic Church) a vessel (usually of gold or silver) in which the consecrated Host is exposed for adoration(noun.artifact)

  Synonym:
  ostensorium
  

  source: wordnet30
• A transparent pyx, in which the consecrated host is exposed to view.(noun)

  source: webster1913