monstrance -
An ornamental, often precious receptacle, either open or with a transparent cover, in which the consecrated host is placed for veneration.
Wikipedia
A monstrance is the vessel used in the Roman Catholic, Old Catholic and Anglican churches to display the consecrated Eucharistic host, during Eucharistic adoration or Benediction of the Blessed Sacrament. Created in the medieval period for the public display of relics, the monstrance today is usually restricted for vessels used for hosts. The word monstrance comes from the Latin word monstrare, meaning "to show", and is cognate with the English word demonstrate, meaning "to show clearly".
OmegaWiki Dictionary
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monstrance A vessel (usually made of gold or silver) in which the consecrated Host is exposed for adoration.
