mastoid process

  1. a large, bony prominence on the base of the skull behind the ear, containing air spaces that connect with the middle ear cavity.

Origin of mastoid process

First recorded in 1725–35
  • Also called mastoid, mastoid bone .

Words Nearby mastoid process Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use mastoid process in a sentence

Scientific definitions for mastoid process

mastoid process

[ măstoid′ ]

  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.