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emissarium

noun
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em·​is·​sar·​i·​um | \ ˌeməˈsa(a)rēəm \
plural emissaria\ -​ēə \

Definition of emissarium

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

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History and Etymology for emissarium

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

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“Emissarium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/emissarium. Accessed 13 Jul. 2020.

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