epi

upon; over

Spelled epi · epi 'on, upon, over'; also 'toward' or 'in addition'

Greek epi meant upon: an epithet is placed upon a name, an epigraph upon a work, and an epidermis upon deeper skin.

Words built from it

epitome — a perfect example of a quality or type
Greek epi- (on) + temnein (cut) → epitemnein (abridge) → epitome (summary) → epitome
epithet — a descriptive name or phrase applied to someone or something
Greek epi- (upon) + tithenai (put) → epithetos (added) → epitheton → epithet
epistolary — relating to letters or written as a series of letters
Greek epi- (toward) + stellein (send) → epistellein (send a message) → epistole (letter) → Latin epistolaris → epistolary
epidermis — the outer layer of skin
Greek epi- (upon) + derma (skin) → epidermis (outer skin) → epidermis
epilogue — a concluding section added after a story's main action
Greek epi- (in addition) + logos (speech) → epilogos (concluding speech) → epilogue
epigraph — a quotation placed at the beginning of a work; also, an inscription
Greek epi- (upon) + graphein (write) → epigraphe (inscription) → epigraph
episode — a distinct event or one installment of a larger story
Greek epi- (in addition) + eisodos (entrance, from eis 'into' + hodos 'way') → epeisodion (interlude) → episode

decrepit — From Latin decrepitus, 'very old, worn out'; its internal letters epi do not represent the Greek prefix.

-ary/-ory — Makes adjectives meaning relating to, or nouns for associated people, things, or places.
graph — writing