adjective Anatomy.
of or pertaining to the mastoid process.
resembling a breast or nipple.

1725–35; < Neo-Latin mastoīdēs < Greek mastoeidḗs. See masto-, -oid

intermastoid, adjective
postmastoid, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mastoid (ˈmæstɔɪd)
1.  shaped like a nipple or breast
2.  designating or relating to a nipple-like process of the temporal bone behind the ear
3.  the mastoid process
4.  informal mastoiditis

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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Word Origin & History

1732, from Gk. mastoeides "resembling a breast," from mastos "breast" (see mastectomy) + -oeides "like," from eidos "form, shape" (see -oid).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

mastoid mas·toid (mās'toid')
The mastoid process. adj.

  1. Of or relating to the mastoid process, antrum, or sinuses.

  2. Shaped like a breast or nipple.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Mastoiditis is an infection of the mastoid bone of the skull.
In the tympanic antrum and mastoid cells its epithelium is also non-ciliated.
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