emissary vein

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Noun1.emissary vein - one of several connecting veins in the scalp and head that drain blood from sinuses in the dura mater to veins outside the skull
vein, vena, venous blood vessel - a blood vessel that carries blood from the capillaries toward the heart; "all veins except the pulmonary vein carry unaerated blood"
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Piranesi engraved many other views and details of aqueducts and fountains, and was particularly fascinated by the underground emissarium which controlled the outflow of water from Lake Albano.