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neo-

  1. a combining form meaning “new,” “recent,” “revived,” “modified,” used in the formation of compound words: neo-Darwinism; Neolithic; neoorthodoxy; neophyte.
  2. Chemistry. a combining form used in the names of isomers having a carbon atom attached to four carbon atoms: neoarsphenamine.
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Also especially before a vowel, ne-.

Origin of neo-

< Greek, combining form of néos; akin to new
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for neo-

neo-

sometimes before a vowel ne-

combining form
  1. (sometimes capital) new, recent, or a new or modern form or developmentneoclassicism; neocolonialism
  2. (usually capital) the most recent subdivision of a geological periodNeogene
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Word Origin for neo-

from Greek neos new
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for neo-

word-forming element meaning "new, recent," used in a seemingly endless number of adjectives and nouns, mostly coined since c.1880, from Greek neo-, comb. form of neos "new, young, youthful; fresh, strange; lately, just now," from PIE root *newo- (see new).

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Online Etymology Dictionary, © 2010 Douglas Harper

neo- in Medicine

neo-

pref.
  1. New; recent:neonatal.
  2. New and different:Neo-Freudian.
  3. New and abnormal:neoplasm.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.