Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

epi-

prefix
variants: or ep-

Definition of epi-

1 : upon epiphyte : besides epiphenomenon : attached to epididymis : over epicenter : outer epiblast : after epigenesis
2a : chemical entity related to (such) another epimer
b : chemical entity distinguished from (such) another by having a bridge connection epichlorohydrin

History and Etymology for epi-

Latin, from Greek, from epi on, at, besides, after; akin to Old English eofot crime

Keep scrolling for more

Learn More about epi-

Statistics for epi-

Look-up Popularity

Comments on epi-

What made you want to look up epi-? Please tell us where you read or heard it (including the quote, if possible).

Show Comments  Hide Comments 

WORD OF THE DAY

gnomic

Listen to the pronounciation of gnomic

characterized by aphorism

Get Word of the Day daily email!

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play
Ask the Editors
Word Games