ὄρειον
From LSJ
Ῥῦσέ με δεινῶν νοσημάτων, ἱερώτατε, ἱερωσύνην συναρμόσας ἐν χαρᾷ και ἐπιστήμης τὸ πολύτιμον κεφάλαιον → Deliver me from grievous afflictions, most holy one, joining sanctity together in joy with the precious fountainhead of knowledge
English (LSJ)
τό, A = πολύγονον θῆλυ, mare's tail, Hippuris vulgaris, Plin. HN27.115. ὀρείονες, v. ὀρεᾶνες.