Definition of euripus:
(n) :
A strait; a narrow tract of water, where the tide or a current flows and reflows with violence, like the ancient firth of this name between Euboea and Boeotia.
(n) :
(by extension) A flux and reflux.
(n) :
Short for Euripus Strait. [A strait between Euboea and Boeotia in mainland Greece.]