mastoid-process

mastoid process

noun
a large, bony prominence on the base of the skull behind the ear, containing air spaces that connect with the middle ear cavity.
Also called mastoid, mastoid bone.


Origin:
1725–35

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American Heritage
Medical Dictionary

mastoid process n.

  1. A conical protuberance of the posterior portion of the temporal bone that is situated behind the ear and serves as a site of muscle attachment. Also called mastoid bone.

  2. The part of the first pharyngeal arch in the embryo, developing into the upper jaw in the embryo.

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
mastoid process   (mās'toid')  Pronunciation Key 
A protruding bony area in the lower part of the skull that is located behind the ear in humans and many other vertebrates and serves as a site of muscle attachment. The mastoid process contains small air-filled cavities called mastoid cells that communicate with the middle ear.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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