EURIPUS
Etymology
Noun
euripus (plural euripuses or euripi)
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 Eubaea and Baeotia.
(by extension) A flux and reflux.
Source: Wiktionary
Eu*ri"pus, n. Etym: [L., fr. Gr.
Definition: A strait; a narrow tract of water, where the tide, or a
current, flows and reflows with violence, as the ancient fright of
this name between Eubæa and Bæotia. Hence, a flux and reflux. Burke.
Source: Webster’s Unabridged Dictionary 1913 Edition