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emissarium

noun em·is·sar·i·um \ ˌeməˈsa(a)rēəm \

Definition of emissarium

plural emissaria \-ēə\
: a subterranean channel used by the ancient Romans for the drainage of a lake lacking a natural outlet

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Origin and Etymology of emissarium

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

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