*euripus*

n. [ L., fr. Gr. &unr_;; e'y^ well + &unr_; a rushing motion. ] A strait; a narrow tract of water, where the tide, or a current, flows and reflows with violence, as the ancient frith of this name between Eubœa and Bœotia. Hence, a flux and reflux. Burke. [ 1913 Webster ]