
Euripos (Εύριπος) was an ancient Greek city in Acarnania. ...
Found on
http://en.wikipedia.org/wiki/Euripos

(Greek; pl. euripoi: narrow water drainage channel, a canal, conduit or aqueduct). This was the water drainage trench that ran around the perimeter of the orchestra in ancient theatres. In more sophisticated constructions the euripos was covered with paving tiles and connected to an underground sewer system.
Found on
https://www.whitman.edu/theatre/theatretour/glossary/glossary.htm
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