(Roman Catholic Church) a vessel (usually of gold or silver) in which the consecrated Host is exposed for adoration WordNet 3.0 & Open English WordNet

A monstrance, also known as an ostensorium, is a vessel used in Roman Catholic, Old Catholic, High Church Lutheran and Anglican churches for the display on an altar of some object of piety, such as the consecrated Eucharistic host during Eucharistic adoration or Benediction of the Blessed Sacrament. Wikipedia

Vessel used to display religious object in the Christian tradition Wikidata

A vessel (usually made of gold or silver) in which the consecrated Host is exposed for adoration. OmegaWiki

An ornamental, often precious receptacle, either open or with a transparent cover, in which the sacramental bread is placed for veneration. Wiktionary

Ornamental in which the consecrated host is placed for veneration. Wiktionary (translation)

An ostensory, or monstrance. Wiktionary