Epi- pref. A prefix, meaning upon, beside, among, on the outside, above, over. It becomes ep-before a vowel, as in epoch, and eph-before a Greek aspirate, as in ephemeral.
... d'ote de limenos polubentheos entos ikonto Istia men steilanto, thesand d'en nei melaine . . . Ek de kai antoi Bainon epi regmini thalasses." ... — From a Cornish Window - A New Edition • Arthur Thomas Quiller-Couch
...EPI. In what I can, that ye like to speir at me, I will willinglie and freelie tell my opinion, and if I proue it not sufficiently, I am heartely content that a better reason ... — Daemonologie. • King James I
... {epi tou proneiou tes gonies}, cp. viii. 122: the use of {epi} seems to suggest some kind of raised corner-stone ... — The History Of Herodotus - Volume 1(of 2) • Herodotus