Source : Webster's Revised Unabridged Dictionary (1913)

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}.