An outlet, duct, or channel through which something (like a fluid or emission) passes or is discharged, especially in anatomy.
From Latin emissarium, derived from emittere (to send out). In anatomy, it refers to small canals in bones, particularly the skull, that allow blood vessels to exit.
The Romans who coined this term literally designed drainage systems called 'emissaria' for their cities, so when anatomists found similar drain-like structures in bones, they borrowed the word—real-world engineering language became medical language.
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