Epicenter, epidural, epilation, and epinephrine are all words that start with the prefix epi-.
epi
dermis, from the latin word "derma" meaning skin, is the root word epi is the prefix meaning "on"
Epi is the prefix to change to "dia". One has "epi"logue which changes to "dia"logue...a conversation.
One likely possibility would be "epi."
mid
epi/gastricEpi- (above)gastr (stomach)-ic (pertaining to)
intra-
Aftershock Aftershock
consequence
Dodecagon
conifer
inarticulate