D defs.my
Entry 1 sense Webster, 1913

Epi-

· Ep·i- · IPA
01 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 aspir…
  1. 1.
    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.