noun, plural craniotomies. Surgery.
the operation of opening the skull, usually for operations on the brain.

1850–55; cranio- + -tomy Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
craniotomy (ˌkreɪnɪˈɒtəmɪ)
n , pl -mies
1.  any surgical incision into the skull, esp to expose the brain for neurosurgery
2.  the surgical crushing of a fetal skull to extract a dead fetus

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1855, from Mod.L., from Gk. kranion "skull" (see cranium) + connecting element -o- + -tomy.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

craniotomy cra·ni·ot·o·my (krā'nē-ŏt'ə-mē)
Incision into the skull.

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
craniotomy   (krā'nē-ŏt'ə-mē)  Pronunciation Key 
Surgical incision into the skull.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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