noun, plural mas·toid·ec·to·mies. Surgery.

the removal of part of a mastoid process, usually for draining an infection.

Origin of mastoidectomy

First recorded in 1895–1900; mastoid + -ectomy Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for mastoidectomy


noun plural -mies

surgical removal of the mastoid process
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

mastoidectomy in Medicine




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.