The Collaborative International Dictionary
Ostensorium
Ostensorium \Os`ten*so"ri*um\, Ostensory \Os*ten"so*ry\, n.; pl. L. -soria, E. -sories. [NL. ostensorium: cf. F. ostensoir. See Ostensible.] (R. C. Ch.) Same as Monstrance.
Wiktionary
ostensorium
n. An ostensory, or monstrance.