A.any strait or narrow sea, where the flux and reflux is violent, X.HG1.6.22, Arist.HA544a21, 548a9, Mu.396a25; esp. the strait which separates Euboea from Boeotia, h.Ap.222, Hdt.5.77, etc., cf. Str.9.2.8: prov. of an unstable, weak-minded person (cf. Poll.6.121), “πλείους τραπόμενος τροπὰς τοῦ Εὐρίπου” Aeschin.3.90; “μεταρρεῖ ὥσπερ Εὔριπος” Arist.EN1167b7; “ἄστατα καὶ ἀβέβαια Εὐρίπου τρόπον” Hipparch. ap. Stob.4.44.81; “Εὔριποι γενόμενοι” Lib.Ep.907.
II. generally, canal, ditch, etc., SIG799.7 (Cyzicus, i A.D.), Babr.120.2, AP14.135.2 (Metrod.), D.H.3.68.
2. the Spina in the Circus, Lyd.Mens.1.12.