Definify.com
Webster 1913 Edition
Epi-
‖
Ep′i-
.[Gr.
ἐπί
on, upon, to; akin to Skr. api
besides, and prob. to L. ob
to, before, on account of, and perh. to E. of
, off
.] 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.