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mastoid process

noun
1.
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
1725-1735
1725-35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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mastoid-bone in Medicine

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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mastoid-bone in Science
mastoid process
  (mās'toid')   
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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Encyclopedia Article for mastoid-bone

mastoid process

the smooth pyramidal or cone-shaped bone projection at the base of the skull on each side of the head just below and behind the ear in humans. The mastoid process is important to students of fossil humans because it occurs regularly and in the specific form described only in hominids (i.e., members of the genera Homo and Australopithecus). The development of the mastoid process is apparently related to the upright posture of hominids and the consequent evolutionary realignment of the head in relation to the neck

Learn more about mastoid process with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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