variants: or before a vowel ne-

Definition of neo-

1a : new : recent Neogene
b : new and different period or form of Neoplatonism : in a new and different form or manner Neoplatonic
c : New World Nearctic Neotropical
d : new and abnormal neoplasm
2 : new chemical compound isomeric with or otherwise related to (such) a compound neostigmine

History and Etymology for neo-

borrowed from Greek neo-, combining form from néos "young, fresh, new" — more at new entry 1

Keep scrolling for more

Learn More about neo-

Statistics for neo-

Cite this Entry

“Neo-.” Dictionary, Merriam-Webster, Accessed 7 Jun. 2020.

Comments on neo-

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


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

May 2020 Words of the Day Quiz

  • a blooming wisteria tree
  • Which is a synonym of exiguous?
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

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

Love words? Need even more definitions?

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