mastoid

1 of 2

adjective

mas·​toid ˈma-ˌstȯid How to pronounce mastoid (audio)
1
: being the process of the temporal bone behind the ear
also : being any of several bony elements that occupy a similar position in the skull of lower vertebrates
2
: of, relating to, or occurring in the region of the mastoid process

mastoid

2 of 2

noun

: a mastoid bone or process

Examples of mastoid in a Sentence

Recent Examples on the Web
Adjective
The electrodes on the mastoid process recorded brain activity while those on the ear were used as a ground wire. IEEE Spectrum, 16 Mar. 2015 If left untreated, the infection could have spread to the air pockets of the mastoid bones, filling them with infected material and creating potentially life-threatening conditions like meningitis or blood clots. Jane Recker, Smithsonian Magazine, 24 Feb. 2022 But on the right side there was something else: A mass about the size of a strawberry had destroyed much of the mastoid bone just behind her ear. New York Times, 31 Mar. 2021 Evidence of perforations were found on both sides of the skull near the mastoid bones (located just behind the ear). Jennifer Ouellette, Ars Technica, 24 Feb. 2022 The surgeon makes an incision behind the ear to expose the mastoid bone. Jeremy Hillpot, Discover Magazine, 5 July 2021 From childhood, when a mastoid operation resulted in permanent eardrum damage and hearing loss, she had been fascinated with eyes, watching for cues to amplify what was being said. New York Times, 28 June 2022 Then the surgeon will remove any infected mastoid bone or tissue, stitch up the cut, and bandage the wound. Jennifer Ouellette, Ars Technica, 24 Feb. 2022 According to the Independent, the placement of the cuts suggests the patient had a mastoidectomy—surgery undertaken to treat an infection of the mastoid bones, which are located just behind each ear. Jane Recker, Smithsonian Magazine, 24 Feb. 2022
Noun
More were placed behind the right ear, near the mastoid, which perceives visual sensations. IEEE Spectrum, 16 Dec. 2023 Insets: enlarged images of the cut marks in the left ear, next to the mastoid. Jennifer Ouellette, Ars Technica, 24 Feb. 2022 But cholesteatoma tends to erode the bony wall (scutum) separating the ear canal from the mastoid, and the scutum was intact on both sides of the woman's skull. Jennifer Ouellette, Ars Technica, 24 Feb. 2022 A doctor tried to resolve the problem with an operation on the mastoid that left him deaf in one ear. Frederick N. Rasmussen, baltimoresun.com, 17 Aug. 2017 Part of the rear of the skull called the mastoid bears some telltale otter traits, Natural History Museum of Los Angeles paleontologist Xiaoming Wang and colleagues write, but the first molar— Brian Switek, Smithsonian, 23 Jan. 2017

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'mastoid.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

Etymology

Adjective

borrowed from New Latin mastoīdēs, borrowed from Greek mastoeidḗs "like a breast or nipple" (in mastoeideîs apophýseis "mastoid processes," from the nipple-like protuberance formed by the bone), from mastós "breast, nipple" (probably from a pre-Greek substratal language) + -oidēs -oid entry 1

Noun

by ellipsis from mastoid process, mastoid bone, etc.

First Known Use

Adjective

1732, in the meaning defined at sense 1

Noun

1840, in the meaning defined above

Time Traveler
The first known use of mastoid was in 1732

Dictionary Entries Near mastoid

Cite this Entry

“Mastoid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mastoid. Accessed 19 Mar. 2024.

Kids Definition

mastoid

1 of 2 adjective
mas·​toid ˈmas-ˌtȯid How to pronounce mastoid (audio)
: of, relating to, or being the mastoid process
also : occurring in the region of the mastoid process

mastoid

2 of 2 noun
: a mastoid bone or process

Medical Definition

mastoid

1 of 2 adjective
mas·​toid ˈmas-ˌtȯid How to pronounce mastoid (audio)
: of, relating to, or being the mastoid process
also : occurring in the region of the mastoid process

mastoid

2 of 2 noun
: a mastoid bone or process

More from Merriam-Webster on mastoid

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!