paleo-

a combining form meaning “old” or “ancient,” especially in reference to former geologic time periods, used in the formation of compound words: paleobotany.
Also, pale-, especially British, palae-, palaeo-.


Origin:
< Greek palaio-, combining form of palaiós

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Collins
World English Dictionary
paleo- or (before a vowel) pale-
 
combining form
variants (esp US) of palaeo-
 
pale- or (before a vowel) pale-
 
combining form

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

paleo-
prefix used in scientific combinations (mostly since c.1870), from Gk. palaio-, comb. form of palaios "old, ancient," from palai "long ago, far back," related to palin "again, backwards," tele- "far off, at a distance," from PIE base *kwel- "to turn, move about," also "far" (in space and time); see
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

paleo- or pale-
pref.

  1. Ancient; prehistoric; old: paleopathology.

  2. Early; primitive: paleokinetic.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
paleo-  
A prefix that means "prehistoric" (as in paleontology) or "early or primitive" (as in Paleolithic).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They need to study a group that doesn't eat any starches, ie the paleo dieters.
Paleo hunters pursued bighorn sheep and deer and left split-twig figurines in caves.
If you think that one could do better with paleo data, then you're fooling yourself.
Paleo-Indians moved into the northern forest not long after the glaciers receded.
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