Source : Webster's Revised Unabridged Dictionary (1913)

Euripus \Eu*ri"pus\, n. [L., fr. Gr. ?; ? well + ? a rushing
   motion.]
   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 Eub[ae]a and B[ae]otia. Hence, a
   flux and reflux. --Burke.