noun, plural mastoidectomies. Surgery.
the removal of part of a mastoid process, usually for draining an infection.

1895–1900; mastoid + -ectomy Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mastoidectomy (ˌmæstɔɪˈdɛktəmɪ)
n , pl -mies
surgical removal of the mastoid process

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

mastoidectomy mas·toid·ec·to·my (mās'toi-děk'tə-mē)
Surgical removal of mastoid sinuses or part or all of the mastoid process.

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