(Roman Catholic Church) a vessel (usually of gold or silver) in which the consecrated Host is exposed for adoration.
1
I have a communion-service and an ostensorium for you, whose sculptures are worthy of Benvenuto Cellini.
2
After remaining a considerable time in prayer she felt suddenly inspired to raise her eyes and look at the holy Host in the ostensorium.
3
What is the Ostensorium or Monstrance?
4
The Ostensorium or Monstrance is the beautiful wheel-like vessel in which the Blessed Sacrament is exposed and kept during the Benediction.