emissarium
noun
em·is·sar·i·um
\ˌeməˈsa(a)rēəm\
Definition of emissarium
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 — more at emit
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