ostensorium

noun

os·​ten·​so·​ri·​um ˌä-stən-ˈsȯr-ē-əm 

-ˌsten-

plural ostensoria ˌä-stən-ˈsȯr-ē-ə 

-ˌsten-

: monstrance

Word History

Etymology

borrowed from New Latin ostensōrium, from Latin ostendere "to hold out for inspection, show, demonstrate" + -tōrium, suffix of place, noun derivative from neuter of -tōrius, deverbal adjective suffix originally forming derivatives from agent nouns ending in -tōr-, -tor — more at ostensible

First Known Use

1760, in the meaning defined above