emissarium

noun

em·​is·​sar·​i·​um

ˌeməˈsa(a)rēəm

plural emissaria

-ēə

: a subterranean channel used by the ancient Romans for the drainage of a lake lacking a natural outlet

Word History

Etymology

Latin, from emissus (past participle of emittere to send out) + -arium

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