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cranio-

  1. a combining form representing cranium in compound words: craniotomy.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for cranio-

cranio-

before a vowel crani-

combining form
  1. indicating the cranium or cranialcraniotomy
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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 cranio-

word-forming element meaning "of the brain," from Latinized comb. form of Greek kranion "skull" (see cranium).

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Online Etymology Dictionary, © 2010 Douglas Harper

cranio- in Medicine

cranio-

pref.
  1. Cranium:craniospinal.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.