Hypertext Webster Gateway: "epi"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Epi- \Ep"i-\ [Gr. 'epi` 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.
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